SemaDecl.cpp revision c173be2aa78cecc6c35445165e59df99d754a1e0
1//===--- SemaDecl.cpp - Semantic Analysis for Declarations ----------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "Sema.h" 15#include "SemaInit.h" 16#include "Lookup.h" 17#include "clang/AST/APValue.h" 18#include "clang/AST/ASTConsumer.h" 19#include "clang/AST/ASTContext.h" 20#include "clang/AST/CXXInheritance.h" 21#include "clang/AST/DeclTemplate.h" 22#include "clang/AST/ExprCXX.h" 23#include "clang/AST/StmtCXX.h" 24#include "clang/Parse/DeclSpec.h" 25#include "clang/Parse/ParseDiagnostic.h" 26#include "clang/Parse/Template.h" 27#include "clang/Basic/PartialDiagnostic.h" 28#include "clang/Basic/SourceManager.h" 29#include "clang/Basic/TargetInfo.h" 30// FIXME: layering (ideally, Sema shouldn't be dependent on Lex API's) 31#include "clang/Lex/Preprocessor.h" 32#include "clang/Lex/HeaderSearch.h" 33#include "llvm/ADT/Triple.h" 34#include <algorithm> 35#include <cstring> 36#include <functional> 37using namespace clang; 38 39/// getDeclName - Return a pretty name for the specified decl if possible, or 40/// an empty string if not. This is used for pretty crash reporting. 41std::string Sema::getDeclName(DeclPtrTy d) { 42 Decl *D = d.getAs<Decl>(); 43 if (NamedDecl *DN = dyn_cast_or_null<NamedDecl>(D)) 44 return DN->getQualifiedNameAsString(); 45 return ""; 46} 47 48Sema::DeclGroupPtrTy Sema::ConvertDeclToDeclGroup(DeclPtrTy Ptr) { 49 return DeclGroupPtrTy::make(DeclGroupRef(Ptr.getAs<Decl>())); 50} 51 52/// \brief If the identifier refers to a type name within this scope, 53/// return the declaration of that type. 54/// 55/// This routine performs ordinary name lookup of the identifier II 56/// within the given scope, with optional C++ scope specifier SS, to 57/// determine whether the name refers to a type. If so, returns an 58/// opaque pointer (actually a QualType) corresponding to that 59/// type. Otherwise, returns NULL. 60/// 61/// If name lookup results in an ambiguity, this routine will complain 62/// and then return NULL. 63Sema::TypeTy *Sema::getTypeName(IdentifierInfo &II, SourceLocation NameLoc, 64 Scope *S, CXXScopeSpec *SS, 65 bool isClassName, 66 TypeTy *ObjectTypePtr) { 67 // Determine where we will perform name lookup. 68 DeclContext *LookupCtx = 0; 69 if (ObjectTypePtr) { 70 QualType ObjectType = QualType::getFromOpaquePtr(ObjectTypePtr); 71 if (ObjectType->isRecordType()) 72 LookupCtx = computeDeclContext(ObjectType); 73 } else if (SS && SS->isNotEmpty()) { 74 LookupCtx = computeDeclContext(*SS, false); 75 76 if (!LookupCtx) { 77 if (isDependentScopeSpecifier(*SS)) { 78 // C++ [temp.res]p3: 79 // A qualified-id that refers to a type and in which the 80 // nested-name-specifier depends on a template-parameter (14.6.2) 81 // shall be prefixed by the keyword typename to indicate that the 82 // qualified-id denotes a type, forming an 83 // elaborated-type-specifier (7.1.5.3). 84 // 85 // We therefore do not perform any name lookup if the result would 86 // refer to a member of an unknown specialization. 87 if (!isClassName) 88 return 0; 89 90 // We know from the grammar that this name refers to a type, so build a 91 // DependentNameType node to describe the type. 92 // FIXME: Record somewhere that this DependentNameType node has no "typename" 93 // keyword associated with it. 94 return CheckTypenameType((NestedNameSpecifier *)SS->getScopeRep(), 95 II, SS->getRange()).getAsOpaquePtr(); 96 } 97 98 return 0; 99 } 100 101 if (!LookupCtx->isDependentContext() && RequireCompleteDeclContext(*SS)) 102 return 0; 103 } 104 105 // FIXME: LookupNestedNameSpecifierName isn't the right kind of 106 // lookup for class-names. 107 LookupNameKind Kind = isClassName ? LookupNestedNameSpecifierName : 108 LookupOrdinaryName; 109 LookupResult Result(*this, &II, NameLoc, Kind); 110 if (LookupCtx) { 111 // Perform "qualified" name lookup into the declaration context we 112 // computed, which is either the type of the base of a member access 113 // expression or the declaration context associated with a prior 114 // nested-name-specifier. 115 LookupQualifiedName(Result, LookupCtx); 116 117 if (ObjectTypePtr && Result.empty()) { 118 // C++ [basic.lookup.classref]p3: 119 // If the unqualified-id is ~type-name, the type-name is looked up 120 // in the context of the entire postfix-expression. If the type T of 121 // the object expression is of a class type C, the type-name is also 122 // looked up in the scope of class C. At least one of the lookups shall 123 // find a name that refers to (possibly cv-qualified) T. 124 LookupName(Result, S); 125 } 126 } else { 127 // Perform unqualified name lookup. 128 LookupName(Result, S); 129 } 130 131 NamedDecl *IIDecl = 0; 132 switch (Result.getResultKind()) { 133 case LookupResult::NotFound: 134 case LookupResult::NotFoundInCurrentInstantiation: 135 case LookupResult::FoundOverloaded: 136 case LookupResult::FoundUnresolvedValue: 137 Result.suppressDiagnostics(); 138 return 0; 139 140 case LookupResult::Ambiguous: 141 // Recover from type-hiding ambiguities by hiding the type. We'll 142 // do the lookup again when looking for an object, and we can 143 // diagnose the error then. If we don't do this, then the error 144 // about hiding the type will be immediately followed by an error 145 // that only makes sense if the identifier was treated like a type. 146 if (Result.getAmbiguityKind() == LookupResult::AmbiguousTagHiding) { 147 Result.suppressDiagnostics(); 148 return 0; 149 } 150 151 // Look to see if we have a type anywhere in the list of results. 152 for (LookupResult::iterator Res = Result.begin(), ResEnd = Result.end(); 153 Res != ResEnd; ++Res) { 154 if (isa<TypeDecl>(*Res) || isa<ObjCInterfaceDecl>(*Res)) { 155 if (!IIDecl || 156 (*Res)->getLocation().getRawEncoding() < 157 IIDecl->getLocation().getRawEncoding()) 158 IIDecl = *Res; 159 } 160 } 161 162 if (!IIDecl) { 163 // None of the entities we found is a type, so there is no way 164 // to even assume that the result is a type. In this case, don't 165 // complain about the ambiguity. The parser will either try to 166 // perform this lookup again (e.g., as an object name), which 167 // will produce the ambiguity, or will complain that it expected 168 // a type name. 169 Result.suppressDiagnostics(); 170 return 0; 171 } 172 173 // We found a type within the ambiguous lookup; diagnose the 174 // ambiguity and then return that type. This might be the right 175 // answer, or it might not be, but it suppresses any attempt to 176 // perform the name lookup again. 177 break; 178 179 case LookupResult::Found: 180 IIDecl = Result.getFoundDecl(); 181 break; 182 } 183 184 assert(IIDecl && "Didn't find decl"); 185 186 QualType T; 187 if (TypeDecl *TD = dyn_cast<TypeDecl>(IIDecl)) { 188 DiagnoseUseOfDecl(IIDecl, NameLoc); 189 190 if (T.isNull()) 191 T = Context.getTypeDeclType(TD); 192 193 if (SS) 194 T = getQualifiedNameType(*SS, T); 195 196 } else if (ObjCInterfaceDecl *IDecl = dyn_cast<ObjCInterfaceDecl>(IIDecl)) { 197 T = Context.getObjCInterfaceType(IDecl); 198 } else if (UnresolvedUsingTypenameDecl *UUDecl = 199 dyn_cast<UnresolvedUsingTypenameDecl>(IIDecl)) { 200 // FIXME: preserve source structure information. 201 T = Context.getDependentNameType(ETK_None, 202 UUDecl->getTargetNestedNameSpecifier(), 203 &II); 204 } else { 205 // If it's not plausibly a type, suppress diagnostics. 206 Result.suppressDiagnostics(); 207 return 0; 208 } 209 210 return T.getAsOpaquePtr(); 211} 212 213/// isTagName() - This method is called *for error recovery purposes only* 214/// to determine if the specified name is a valid tag name ("struct foo"). If 215/// so, this returns the TST for the tag corresponding to it (TST_enum, 216/// TST_union, TST_struct, TST_class). This is used to diagnose cases in C 217/// where the user forgot to specify the tag. 218DeclSpec::TST Sema::isTagName(IdentifierInfo &II, Scope *S) { 219 // Do a tag name lookup in this scope. 220 LookupResult R(*this, &II, SourceLocation(), LookupTagName); 221 LookupName(R, S, false); 222 R.suppressDiagnostics(); 223 if (R.getResultKind() == LookupResult::Found) 224 if (const TagDecl *TD = R.getAsSingle<TagDecl>()) { 225 switch (TD->getTagKind()) { 226 case TagDecl::TK_struct: return DeclSpec::TST_struct; 227 case TagDecl::TK_union: return DeclSpec::TST_union; 228 case TagDecl::TK_class: return DeclSpec::TST_class; 229 case TagDecl::TK_enum: return DeclSpec::TST_enum; 230 } 231 } 232 233 return DeclSpec::TST_unspecified; 234} 235 236bool Sema::DiagnoseUnknownTypeName(const IdentifierInfo &II, 237 SourceLocation IILoc, 238 Scope *S, 239 CXXScopeSpec *SS, 240 TypeTy *&SuggestedType) { 241 // We don't have anything to suggest (yet). 242 SuggestedType = 0; 243 244 // There may have been a typo in the name of the type. Look up typo 245 // results, in case we have something that we can suggest. 246 LookupResult Lookup(*this, &II, IILoc, LookupOrdinaryName, 247 NotForRedeclaration); 248 249 // FIXME: It would be nice if we could correct for typos in built-in 250 // names, such as "itn" for "int". 251 252 if (CorrectTypo(Lookup, S, SS) && Lookup.isSingleResult()) { 253 NamedDecl *Result = Lookup.getAsSingle<NamedDecl>(); 254 if ((isa<TypeDecl>(Result) || isa<ObjCInterfaceDecl>(Result)) && 255 !Result->isInvalidDecl()) { 256 // We found a similarly-named type or interface; suggest that. 257 if (!SS || !SS->isSet()) 258 Diag(IILoc, diag::err_unknown_typename_suggest) 259 << &II << Lookup.getLookupName() 260 << FixItHint::CreateReplacement(SourceRange(IILoc), 261 Result->getNameAsString()); 262 else if (DeclContext *DC = computeDeclContext(*SS, false)) 263 Diag(IILoc, diag::err_unknown_nested_typename_suggest) 264 << &II << DC << Lookup.getLookupName() << SS->getRange() 265 << FixItHint::CreateReplacement(SourceRange(IILoc), 266 Result->getNameAsString()); 267 else 268 llvm_unreachable("could not have corrected a typo here"); 269 270 Diag(Result->getLocation(), diag::note_previous_decl) 271 << Result->getDeclName(); 272 273 SuggestedType = getTypeName(*Result->getIdentifier(), IILoc, S, SS); 274 return true; 275 } 276 } 277 278 if (getLangOptions().CPlusPlus) { 279 // See if II is a class template that the user forgot to pass arguments to. 280 UnqualifiedId Name; 281 Name.setIdentifier(&II, IILoc); 282 CXXScopeSpec EmptySS; 283 TemplateTy TemplateResult; 284 if (isTemplateName(S, SS ? *SS : EmptySS, Name, 0, true, TemplateResult) 285 == TNK_Type_template) { 286 TemplateName TplName = TemplateResult.getAsVal<TemplateName>(); 287 Diag(IILoc, diag::err_template_missing_args) << TplName; 288 if (TemplateDecl *TplDecl = TplName.getAsTemplateDecl()) { 289 Diag(TplDecl->getLocation(), diag::note_template_decl_here) 290 << TplDecl->getTemplateParameters()->getSourceRange(); 291 } 292 return true; 293 } 294 } 295 296 // FIXME: Should we move the logic that tries to recover from a missing tag 297 // (struct, union, enum) from Parser::ParseImplicitInt here, instead? 298 299 if (!SS || (!SS->isSet() && !SS->isInvalid())) 300 Diag(IILoc, diag::err_unknown_typename) << &II; 301 else if (DeclContext *DC = computeDeclContext(*SS, false)) 302 Diag(IILoc, diag::err_typename_nested_not_found) 303 << &II << DC << SS->getRange(); 304 else if (isDependentScopeSpecifier(*SS)) { 305 Diag(SS->getRange().getBegin(), diag::err_typename_missing) 306 << (NestedNameSpecifier *)SS->getScopeRep() << II.getName() 307 << SourceRange(SS->getRange().getBegin(), IILoc) 308 << FixItHint::CreateInsertion(SS->getRange().getBegin(), "typename "); 309 SuggestedType = ActOnTypenameType(SourceLocation(), *SS, II, IILoc).get(); 310 } else { 311 assert(SS && SS->isInvalid() && 312 "Invalid scope specifier has already been diagnosed"); 313 } 314 315 return true; 316} 317 318// Determines the context to return to after temporarily entering a 319// context. This depends in an unnecessarily complicated way on the 320// exact ordering of callbacks from the parser. 321DeclContext *Sema::getContainingDC(DeclContext *DC) { 322 323 // Functions defined inline within classes aren't parsed until we've 324 // finished parsing the top-level class, so the top-level class is 325 // the context we'll need to return to. 326 if (isa<FunctionDecl>(DC)) { 327 DC = DC->getLexicalParent(); 328 329 // A function not defined within a class will always return to its 330 // lexical context. 331 if (!isa<CXXRecordDecl>(DC)) 332 return DC; 333 334 // A C++ inline method/friend is parsed *after* the topmost class 335 // it was declared in is fully parsed ("complete"); the topmost 336 // class is the context we need to return to. 337 while (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC->getLexicalParent())) 338 DC = RD; 339 340 // Return the declaration context of the topmost class the inline method is 341 // declared in. 342 return DC; 343 } 344 345 if (isa<ObjCMethodDecl>(DC)) 346 return Context.getTranslationUnitDecl(); 347 348 return DC->getLexicalParent(); 349} 350 351void Sema::PushDeclContext(Scope *S, DeclContext *DC) { 352 assert(getContainingDC(DC) == CurContext && 353 "The next DeclContext should be lexically contained in the current one."); 354 CurContext = DC; 355 S->setEntity(DC); 356} 357 358void Sema::PopDeclContext() { 359 assert(CurContext && "DeclContext imbalance!"); 360 361 CurContext = getContainingDC(CurContext); 362} 363 364/// EnterDeclaratorContext - Used when we must lookup names in the context 365/// of a declarator's nested name specifier. 366/// 367void Sema::EnterDeclaratorContext(Scope *S, DeclContext *DC) { 368 // C++0x [basic.lookup.unqual]p13: 369 // A name used in the definition of a static data member of class 370 // X (after the qualified-id of the static member) is looked up as 371 // if the name was used in a member function of X. 372 // C++0x [basic.lookup.unqual]p14: 373 // If a variable member of a namespace is defined outside of the 374 // scope of its namespace then any name used in the definition of 375 // the variable member (after the declarator-id) is looked up as 376 // if the definition of the variable member occurred in its 377 // namespace. 378 // Both of these imply that we should push a scope whose context 379 // is the semantic context of the declaration. We can't use 380 // PushDeclContext here because that context is not necessarily 381 // lexically contained in the current context. Fortunately, 382 // the containing scope should have the appropriate information. 383 384 assert(!S->getEntity() && "scope already has entity"); 385 386#ifndef NDEBUG 387 Scope *Ancestor = S->getParent(); 388 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 389 assert(Ancestor->getEntity() == CurContext && "ancestor context mismatch"); 390#endif 391 392 CurContext = DC; 393 S->setEntity(DC); 394} 395 396void Sema::ExitDeclaratorContext(Scope *S) { 397 assert(S->getEntity() == CurContext && "Context imbalance!"); 398 399 // Switch back to the lexical context. The safety of this is 400 // enforced by an assert in EnterDeclaratorContext. 401 Scope *Ancestor = S->getParent(); 402 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 403 CurContext = (DeclContext*) Ancestor->getEntity(); 404 405 // We don't need to do anything with the scope, which is going to 406 // disappear. 407} 408 409/// \brief Determine whether we allow overloading of the function 410/// PrevDecl with another declaration. 411/// 412/// This routine determines whether overloading is possible, not 413/// whether some new function is actually an overload. It will return 414/// true in C++ (where we can always provide overloads) or, as an 415/// extension, in C when the previous function is already an 416/// overloaded function declaration or has the "overloadable" 417/// attribute. 418static bool AllowOverloadingOfFunction(LookupResult &Previous, 419 ASTContext &Context) { 420 if (Context.getLangOptions().CPlusPlus) 421 return true; 422 423 if (Previous.getResultKind() == LookupResult::FoundOverloaded) 424 return true; 425 426 return (Previous.getResultKind() == LookupResult::Found 427 && Previous.getFoundDecl()->hasAttr<OverloadableAttr>()); 428} 429 430/// Add this decl to the scope shadowed decl chains. 431void Sema::PushOnScopeChains(NamedDecl *D, Scope *S, bool AddToContext) { 432 // Move up the scope chain until we find the nearest enclosing 433 // non-transparent context. The declaration will be introduced into this 434 // scope. 435 while (S->getEntity() && 436 ((DeclContext *)S->getEntity())->isTransparentContext()) 437 S = S->getParent(); 438 439 // Add scoped declarations into their context, so that they can be 440 // found later. Declarations without a context won't be inserted 441 // into any context. 442 if (AddToContext) 443 CurContext->addDecl(D); 444 445 // Out-of-line definitions shouldn't be pushed into scope in C++. 446 // Out-of-line variable and function definitions shouldn't even in C. 447 if ((getLangOptions().CPlusPlus || isa<VarDecl>(D) || isa<FunctionDecl>(D)) && 448 D->isOutOfLine()) 449 return; 450 451 // Template instantiations should also not be pushed into scope. 452 if (isa<FunctionDecl>(D) && 453 cast<FunctionDecl>(D)->isFunctionTemplateSpecialization()) 454 return; 455 456 // If this replaces anything in the current scope, 457 IdentifierResolver::iterator I = IdResolver.begin(D->getDeclName()), 458 IEnd = IdResolver.end(); 459 for (; I != IEnd; ++I) { 460 if (S->isDeclScope(DeclPtrTy::make(*I)) && D->declarationReplaces(*I)) { 461 S->RemoveDecl(DeclPtrTy::make(*I)); 462 IdResolver.RemoveDecl(*I); 463 464 // Should only need to replace one decl. 465 break; 466 } 467 } 468 469 S->AddDecl(DeclPtrTy::make(D)); 470 IdResolver.AddDecl(D); 471} 472 473bool Sema::isDeclInScope(NamedDecl *&D, DeclContext *Ctx, Scope *S) { 474 return IdResolver.isDeclInScope(D, Ctx, Context, S); 475} 476 477static bool isOutOfScopePreviousDeclaration(NamedDecl *, 478 DeclContext*, 479 ASTContext&); 480 481/// Filters out lookup results that don't fall within the given scope 482/// as determined by isDeclInScope. 483static void FilterLookupForScope(Sema &SemaRef, LookupResult &R, 484 DeclContext *Ctx, Scope *S, 485 bool ConsiderLinkage) { 486 LookupResult::Filter F = R.makeFilter(); 487 while (F.hasNext()) { 488 NamedDecl *D = F.next(); 489 490 if (SemaRef.isDeclInScope(D, Ctx, S)) 491 continue; 492 493 if (ConsiderLinkage && 494 isOutOfScopePreviousDeclaration(D, Ctx, SemaRef.Context)) 495 continue; 496 497 F.erase(); 498 } 499 500 F.done(); 501} 502 503static bool isUsingDecl(NamedDecl *D) { 504 return isa<UsingShadowDecl>(D) || 505 isa<UnresolvedUsingTypenameDecl>(D) || 506 isa<UnresolvedUsingValueDecl>(D); 507} 508 509/// Removes using shadow declarations from the lookup results. 510static void RemoveUsingDecls(LookupResult &R) { 511 LookupResult::Filter F = R.makeFilter(); 512 while (F.hasNext()) 513 if (isUsingDecl(F.next())) 514 F.erase(); 515 516 F.done(); 517} 518 519static bool ShouldDiagnoseUnusedDecl(const NamedDecl *D) { 520 if (D->isInvalidDecl()) 521 return false; 522 523 if (D->isUsed() || D->hasAttr<UnusedAttr>()) 524 return false; 525 526 // White-list anything that isn't a local variable. 527 if (!isa<VarDecl>(D) || isa<ParmVarDecl>(D) || isa<ImplicitParamDecl>(D) || 528 !D->getDeclContext()->isFunctionOrMethod()) 529 return false; 530 531 // Types of valid local variables should be complete, so this should succeed. 532 if (const ValueDecl *VD = dyn_cast<ValueDecl>(D)) { 533 534 // White-list anything with an __attribute__((unused)) type. 535 QualType Ty = VD->getType(); 536 537 // Only look at the outermost level of typedef. 538 if (const TypedefType *TT = dyn_cast<TypedefType>(Ty)) { 539 if (TT->getDecl()->hasAttr<UnusedAttr>()) 540 return false; 541 } 542 543 if (const TagType *TT = Ty->getAs<TagType>()) { 544 const TagDecl *Tag = TT->getDecl(); 545 if (Tag->hasAttr<UnusedAttr>()) 546 return false; 547 548 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Tag)) { 549 if (!RD->hasTrivialConstructor()) 550 return false; 551 if (!RD->hasTrivialDestructor()) 552 return false; 553 } 554 } 555 556 // TODO: __attribute__((unused)) templates? 557 } 558 559 return true; 560} 561 562void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) { 563 if (S->decl_empty()) return; 564 assert((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) && 565 "Scope shouldn't contain decls!"); 566 567 for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end(); 568 I != E; ++I) { 569 Decl *TmpD = (*I).getAs<Decl>(); 570 assert(TmpD && "This decl didn't get pushed??"); 571 572 assert(isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?"); 573 NamedDecl *D = cast<NamedDecl>(TmpD); 574 575 if (!D->getDeclName()) continue; 576 577 // Diagnose unused variables in this scope. 578 if (ShouldDiagnoseUnusedDecl(D) && 579 S->getNumErrorsAtStart() == getDiagnostics().getNumErrors()) 580 Diag(D->getLocation(), diag::warn_unused_variable) << D->getDeclName(); 581 582 // Remove this name from our lexical scope. 583 IdResolver.RemoveDecl(D); 584 } 585} 586 587/// getObjCInterfaceDecl - Look up a for a class declaration in the scope. 588/// return 0 if one not found. 589/// 590/// \param Id the name of the Objective-C class we're looking for. If 591/// typo-correction fixes this name, the Id will be updated 592/// to the fixed name. 593/// 594/// \param RecoverLoc if provided, this routine will attempt to 595/// recover from a typo in the name of an existing Objective-C class 596/// and, if successful, will return the lookup that results from 597/// typo-correction. 598ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *&Id, 599 SourceLocation RecoverLoc) { 600 // The third "scope" argument is 0 since we aren't enabling lazy built-in 601 // creation from this context. 602 NamedDecl *IDecl = LookupSingleName(TUScope, Id, LookupOrdinaryName); 603 604 if (!IDecl && !RecoverLoc.isInvalid()) { 605 // Perform typo correction at the given location, but only if we 606 // find an Objective-C class name. 607 LookupResult R(*this, Id, RecoverLoc, LookupOrdinaryName); 608 if (CorrectTypo(R, TUScope, 0) && 609 (IDecl = R.getAsSingle<ObjCInterfaceDecl>())) { 610 Diag(RecoverLoc, diag::err_undef_interface_suggest) 611 << Id << IDecl->getDeclName() 612 << FixItHint::CreateReplacement(RecoverLoc, IDecl->getNameAsString()); 613 Diag(IDecl->getLocation(), diag::note_previous_decl) 614 << IDecl->getDeclName(); 615 616 Id = IDecl->getIdentifier(); 617 } 618 } 619 620 return dyn_cast_or_null<ObjCInterfaceDecl>(IDecl); 621} 622 623/// getNonFieldDeclScope - Retrieves the innermost scope, starting 624/// from S, where a non-field would be declared. This routine copes 625/// with the difference between C and C++ scoping rules in structs and 626/// unions. For example, the following code is well-formed in C but 627/// ill-formed in C++: 628/// @code 629/// struct S6 { 630/// enum { BAR } e; 631/// }; 632/// 633/// void test_S6() { 634/// struct S6 a; 635/// a.e = BAR; 636/// } 637/// @endcode 638/// For the declaration of BAR, this routine will return a different 639/// scope. The scope S will be the scope of the unnamed enumeration 640/// within S6. In C++, this routine will return the scope associated 641/// with S6, because the enumeration's scope is a transparent 642/// context but structures can contain non-field names. In C, this 643/// routine will return the translation unit scope, since the 644/// enumeration's scope is a transparent context and structures cannot 645/// contain non-field names. 646Scope *Sema::getNonFieldDeclScope(Scope *S) { 647 while (((S->getFlags() & Scope::DeclScope) == 0) || 648 (S->getEntity() && 649 ((DeclContext *)S->getEntity())->isTransparentContext()) || 650 (S->isClassScope() && !getLangOptions().CPlusPlus)) 651 S = S->getParent(); 652 return S; 653} 654 655void Sema::InitBuiltinVaListType() { 656 if (!Context.getBuiltinVaListType().isNull()) 657 return; 658 659 IdentifierInfo *VaIdent = &Context.Idents.get("__builtin_va_list"); 660 NamedDecl *VaDecl = LookupSingleName(TUScope, VaIdent, LookupOrdinaryName); 661 TypedefDecl *VaTypedef = cast<TypedefDecl>(VaDecl); 662 Context.setBuiltinVaListType(Context.getTypedefType(VaTypedef)); 663} 664 665/// LazilyCreateBuiltin - The specified Builtin-ID was first used at 666/// file scope. lazily create a decl for it. ForRedeclaration is true 667/// if we're creating this built-in in anticipation of redeclaring the 668/// built-in. 669NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid, 670 Scope *S, bool ForRedeclaration, 671 SourceLocation Loc) { 672 Builtin::ID BID = (Builtin::ID)bid; 673 674 if (Context.BuiltinInfo.hasVAListUse(BID)) 675 InitBuiltinVaListType(); 676 677 ASTContext::GetBuiltinTypeError Error; 678 QualType R = Context.GetBuiltinType(BID, Error); 679 switch (Error) { 680 case ASTContext::GE_None: 681 // Okay 682 break; 683 684 case ASTContext::GE_Missing_stdio: 685 if (ForRedeclaration) 686 Diag(Loc, diag::err_implicit_decl_requires_stdio) 687 << Context.BuiltinInfo.GetName(BID); 688 return 0; 689 690 case ASTContext::GE_Missing_setjmp: 691 if (ForRedeclaration) 692 Diag(Loc, diag::err_implicit_decl_requires_setjmp) 693 << Context.BuiltinInfo.GetName(BID); 694 return 0; 695 } 696 697 if (!ForRedeclaration && Context.BuiltinInfo.isPredefinedLibFunction(BID)) { 698 Diag(Loc, diag::ext_implicit_lib_function_decl) 699 << Context.BuiltinInfo.GetName(BID) 700 << R; 701 if (Context.BuiltinInfo.getHeaderName(BID) && 702 Diags.getDiagnosticLevel(diag::ext_implicit_lib_function_decl) 703 != Diagnostic::Ignored) 704 Diag(Loc, diag::note_please_include_header) 705 << Context.BuiltinInfo.getHeaderName(BID) 706 << Context.BuiltinInfo.GetName(BID); 707 } 708 709 FunctionDecl *New = FunctionDecl::Create(Context, 710 Context.getTranslationUnitDecl(), 711 Loc, II, R, /*TInfo=*/0, 712 FunctionDecl::Extern, false, 713 /*hasPrototype=*/true); 714 New->setImplicit(); 715 716 // Create Decl objects for each parameter, adding them to the 717 // FunctionDecl. 718 if (FunctionProtoType *FT = dyn_cast<FunctionProtoType>(R)) { 719 llvm::SmallVector<ParmVarDecl*, 16> Params; 720 for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) 721 Params.push_back(ParmVarDecl::Create(Context, New, SourceLocation(), 0, 722 FT->getArgType(i), /*TInfo=*/0, 723 VarDecl::None, 0)); 724 New->setParams(Params.data(), Params.size()); 725 } 726 727 AddKnownFunctionAttributes(New); 728 729 // TUScope is the translation-unit scope to insert this function into. 730 // FIXME: This is hideous. We need to teach PushOnScopeChains to 731 // relate Scopes to DeclContexts, and probably eliminate CurContext 732 // entirely, but we're not there yet. 733 DeclContext *SavedContext = CurContext; 734 CurContext = Context.getTranslationUnitDecl(); 735 PushOnScopeChains(New, TUScope); 736 CurContext = SavedContext; 737 return New; 738} 739 740/// MergeTypeDefDecl - We just parsed a typedef 'New' which has the 741/// same name and scope as a previous declaration 'Old'. Figure out 742/// how to resolve this situation, merging decls or emitting 743/// diagnostics as appropriate. If there was an error, set New to be invalid. 744/// 745void Sema::MergeTypeDefDecl(TypedefDecl *New, LookupResult &OldDecls) { 746 // If the new decl is known invalid already, don't bother doing any 747 // merging checks. 748 if (New->isInvalidDecl()) return; 749 750 // Allow multiple definitions for ObjC built-in typedefs. 751 // FIXME: Verify the underlying types are equivalent! 752 if (getLangOptions().ObjC1) { 753 const IdentifierInfo *TypeID = New->getIdentifier(); 754 switch (TypeID->getLength()) { 755 default: break; 756 case 2: 757 if (!TypeID->isStr("id")) 758 break; 759 Context.ObjCIdRedefinitionType = New->getUnderlyingType(); 760 // Install the built-in type for 'id', ignoring the current definition. 761 New->setTypeForDecl(Context.getObjCIdType().getTypePtr()); 762 return; 763 case 5: 764 if (!TypeID->isStr("Class")) 765 break; 766 Context.ObjCClassRedefinitionType = New->getUnderlyingType(); 767 // Install the built-in type for 'Class', ignoring the current definition. 768 New->setTypeForDecl(Context.getObjCClassType().getTypePtr()); 769 return; 770 case 3: 771 if (!TypeID->isStr("SEL")) 772 break; 773 Context.ObjCSelRedefinitionType = New->getUnderlyingType(); 774 // Install the built-in type for 'SEL', ignoring the current definition. 775 New->setTypeForDecl(Context.getObjCSelType().getTypePtr()); 776 return; 777 case 8: 778 if (!TypeID->isStr("Protocol")) 779 break; 780 Context.setObjCProtoType(New->getUnderlyingType()); 781 return; 782 } 783 // Fall through - the typedef name was not a builtin type. 784 } 785 786 // Verify the old decl was also a type. 787 TypeDecl *Old = OldDecls.getAsSingle<TypeDecl>(); 788 if (!Old) { 789 Diag(New->getLocation(), diag::err_redefinition_different_kind) 790 << New->getDeclName(); 791 792 NamedDecl *OldD = OldDecls.getRepresentativeDecl(); 793 if (OldD->getLocation().isValid()) 794 Diag(OldD->getLocation(), diag::note_previous_definition); 795 796 return New->setInvalidDecl(); 797 } 798 799 // If the old declaration is invalid, just give up here. 800 if (Old->isInvalidDecl()) 801 return New->setInvalidDecl(); 802 803 // Determine the "old" type we'll use for checking and diagnostics. 804 QualType OldType; 805 if (TypedefDecl *OldTypedef = dyn_cast<TypedefDecl>(Old)) 806 OldType = OldTypedef->getUnderlyingType(); 807 else 808 OldType = Context.getTypeDeclType(Old); 809 810 // If the typedef types are not identical, reject them in all languages and 811 // with any extensions enabled. 812 813 if (OldType != New->getUnderlyingType() && 814 Context.getCanonicalType(OldType) != 815 Context.getCanonicalType(New->getUnderlyingType())) { 816 Diag(New->getLocation(), diag::err_redefinition_different_typedef) 817 << New->getUnderlyingType() << OldType; 818 if (Old->getLocation().isValid()) 819 Diag(Old->getLocation(), diag::note_previous_definition); 820 return New->setInvalidDecl(); 821 } 822 823 // The types match. Link up the redeclaration chain if the old 824 // declaration was a typedef. 825 // FIXME: this is a potential source of wierdness if the type 826 // spellings don't match exactly. 827 if (isa<TypedefDecl>(Old)) 828 New->setPreviousDeclaration(cast<TypedefDecl>(Old)); 829 830 if (getLangOptions().Microsoft) 831 return; 832 833 if (getLangOptions().CPlusPlus) { 834 // C++ [dcl.typedef]p2: 835 // In a given non-class scope, a typedef specifier can be used to 836 // redefine the name of any type declared in that scope to refer 837 // to the type to which it already refers. 838 if (!isa<CXXRecordDecl>(CurContext)) 839 return; 840 841 // C++0x [dcl.typedef]p4: 842 // In a given class scope, a typedef specifier can be used to redefine 843 // any class-name declared in that scope that is not also a typedef-name 844 // to refer to the type to which it already refers. 845 // 846 // This wording came in via DR424, which was a correction to the 847 // wording in DR56, which accidentally banned code like: 848 // 849 // struct S { 850 // typedef struct A { } A; 851 // }; 852 // 853 // in the C++03 standard. We implement the C++0x semantics, which 854 // allow the above but disallow 855 // 856 // struct S { 857 // typedef int I; 858 // typedef int I; 859 // }; 860 // 861 // since that was the intent of DR56. 862 if (!isa<TypedefDecl >(Old)) 863 return; 864 865 Diag(New->getLocation(), diag::err_redefinition) 866 << New->getDeclName(); 867 Diag(Old->getLocation(), diag::note_previous_definition); 868 return New->setInvalidDecl(); 869 } 870 871 // If we have a redefinition of a typedef in C, emit a warning. This warning 872 // is normally mapped to an error, but can be controlled with 873 // -Wtypedef-redefinition. If either the original or the redefinition is 874 // in a system header, don't emit this for compatibility with GCC. 875 if (getDiagnostics().getSuppressSystemWarnings() && 876 (Context.getSourceManager().isInSystemHeader(Old->getLocation()) || 877 Context.getSourceManager().isInSystemHeader(New->getLocation()))) 878 return; 879 880 Diag(New->getLocation(), diag::warn_redefinition_of_typedef) 881 << New->getDeclName(); 882 Diag(Old->getLocation(), diag::note_previous_definition); 883 return; 884} 885 886/// DeclhasAttr - returns true if decl Declaration already has the target 887/// attribute. 888static bool 889DeclHasAttr(const Decl *decl, const Attr *target) { 890 for (const Attr *attr = decl->getAttrs(); attr; attr = attr->getNext()) 891 if (attr->getKind() == target->getKind()) 892 return true; 893 894 return false; 895} 896 897/// MergeAttributes - append attributes from the Old decl to the New one. 898static void MergeAttributes(Decl *New, Decl *Old, ASTContext &C) { 899 for (const Attr *attr = Old->getAttrs(); attr; attr = attr->getNext()) { 900 if (!DeclHasAttr(New, attr) && attr->isMerged()) { 901 Attr *NewAttr = attr->clone(C); 902 NewAttr->setInherited(true); 903 New->addAttr(NewAttr); 904 } 905 } 906} 907 908/// Used in MergeFunctionDecl to keep track of function parameters in 909/// C. 910struct GNUCompatibleParamWarning { 911 ParmVarDecl *OldParm; 912 ParmVarDecl *NewParm; 913 QualType PromotedType; 914}; 915 916 917/// getSpecialMember - get the special member enum for a method. 918static Sema::CXXSpecialMember getSpecialMember(ASTContext &Ctx, 919 const CXXMethodDecl *MD) { 920 if (const CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(MD)) { 921 if (Ctor->isDefaultConstructor()) 922 return Sema::CXXDefaultConstructor; 923 if (Ctor->isCopyConstructor()) 924 return Sema::CXXCopyConstructor; 925 } 926 927 if (isa<CXXDestructorDecl>(MD)) 928 return Sema::CXXDestructor; 929 930 assert(MD->isCopyAssignment() && "Must have copy assignment operator"); 931 return Sema::CXXCopyAssignment; 932} 933 934/// canREdefineFunction - checks if a function can be redefined. Currently, 935/// only extern inline functions can be redefined, and even then only in 936/// GNU89 mode. 937static bool canRedefineFunction(const FunctionDecl *FD, 938 const LangOptions& LangOpts) { 939 return (LangOpts.GNUMode && !LangOpts.C99 && !LangOpts.CPlusPlus && 940 FD->isInlineSpecified() && 941 FD->getStorageClass() == FunctionDecl::Extern); 942} 943 944/// MergeFunctionDecl - We just parsed a function 'New' from 945/// declarator D which has the same name and scope as a previous 946/// declaration 'Old'. Figure out how to resolve this situation, 947/// merging decls or emitting diagnostics as appropriate. 948/// 949/// In C++, New and Old must be declarations that are not 950/// overloaded. Use IsOverload to determine whether New and Old are 951/// overloaded, and to select the Old declaration that New should be 952/// merged with. 953/// 954/// Returns true if there was an error, false otherwise. 955bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD) { 956 // Verify the old decl was also a function. 957 FunctionDecl *Old = 0; 958 if (FunctionTemplateDecl *OldFunctionTemplate 959 = dyn_cast<FunctionTemplateDecl>(OldD)) 960 Old = OldFunctionTemplate->getTemplatedDecl(); 961 else 962 Old = dyn_cast<FunctionDecl>(OldD); 963 if (!Old) { 964 if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(OldD)) { 965 Diag(New->getLocation(), diag::err_using_decl_conflict_reverse); 966 Diag(Shadow->getTargetDecl()->getLocation(), 967 diag::note_using_decl_target); 968 Diag(Shadow->getUsingDecl()->getLocation(), 969 diag::note_using_decl) << 0; 970 return true; 971 } 972 973 Diag(New->getLocation(), diag::err_redefinition_different_kind) 974 << New->getDeclName(); 975 Diag(OldD->getLocation(), diag::note_previous_definition); 976 return true; 977 } 978 979 // Determine whether the previous declaration was a definition, 980 // implicit declaration, or a declaration. 981 diag::kind PrevDiag; 982 if (Old->isThisDeclarationADefinition()) 983 PrevDiag = diag::note_previous_definition; 984 else if (Old->isImplicit()) 985 PrevDiag = diag::note_previous_implicit_declaration; 986 else 987 PrevDiag = diag::note_previous_declaration; 988 989 QualType OldQType = Context.getCanonicalType(Old->getType()); 990 QualType NewQType = Context.getCanonicalType(New->getType()); 991 992 // Don't complain about this if we're in GNU89 mode and the old function 993 // is an extern inline function. 994 if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) && 995 New->getStorageClass() == FunctionDecl::Static && 996 Old->getStorageClass() != FunctionDecl::Static && 997 !canRedefineFunction(Old, getLangOptions())) { 998 Diag(New->getLocation(), diag::err_static_non_static) 999 << New; 1000 Diag(Old->getLocation(), PrevDiag); 1001 return true; 1002 } 1003 1004 // If a function is first declared with a calling convention, but is 1005 // later declared or defined without one, the second decl assumes the 1006 // calling convention of the first. 1007 // 1008 // For the new decl, we have to look at the NON-canonical type to tell the 1009 // difference between a function that really doesn't have a calling 1010 // convention and one that is declared cdecl. That's because in 1011 // canonicalization (see ASTContext.cpp), cdecl is canonicalized away 1012 // because it is the default calling convention. 1013 // 1014 // Note also that we DO NOT return at this point, because we still have 1015 // other tests to run. 1016 const FunctionType *OldType = OldQType->getAs<FunctionType>(); 1017 const FunctionType *NewType = New->getType()->getAs<FunctionType>(); 1018 const FunctionType::ExtInfo OldTypeInfo = OldType->getExtInfo(); 1019 const FunctionType::ExtInfo NewTypeInfo = NewType->getExtInfo(); 1020 if (OldTypeInfo.getCC() != CC_Default && 1021 NewTypeInfo.getCC() == CC_Default) { 1022 NewQType = Context.getCallConvType(NewQType, OldTypeInfo.getCC()); 1023 New->setType(NewQType); 1024 NewQType = Context.getCanonicalType(NewQType); 1025 } else if (!Context.isSameCallConv(OldTypeInfo.getCC(), 1026 NewTypeInfo.getCC())) { 1027 // Calling conventions really aren't compatible, so complain. 1028 Diag(New->getLocation(), diag::err_cconv_change) 1029 << FunctionType::getNameForCallConv(NewTypeInfo.getCC()) 1030 << (OldTypeInfo.getCC() == CC_Default) 1031 << (OldTypeInfo.getCC() == CC_Default ? "" : 1032 FunctionType::getNameForCallConv(OldTypeInfo.getCC())); 1033 Diag(Old->getLocation(), diag::note_previous_declaration); 1034 return true; 1035 } 1036 1037 // FIXME: diagnose the other way around? 1038 if (OldType->getNoReturnAttr() && 1039 !NewType->getNoReturnAttr()) { 1040 NewQType = Context.getNoReturnType(NewQType); 1041 New->setType(NewQType); 1042 assert(NewQType.isCanonical()); 1043 } 1044 1045 if (getLangOptions().CPlusPlus) { 1046 // (C++98 13.1p2): 1047 // Certain function declarations cannot be overloaded: 1048 // -- Function declarations that differ only in the return type 1049 // cannot be overloaded. 1050 QualType OldReturnType 1051 = cast<FunctionType>(OldQType.getTypePtr())->getResultType(); 1052 QualType NewReturnType 1053 = cast<FunctionType>(NewQType.getTypePtr())->getResultType(); 1054 if (OldReturnType != NewReturnType) { 1055 Diag(New->getLocation(), diag::err_ovl_diff_return_type); 1056 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1057 return true; 1058 } 1059 1060 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old); 1061 const CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New); 1062 if (OldMethod && NewMethod) { 1063 if (!NewMethod->getFriendObjectKind() && 1064 NewMethod->getLexicalDeclContext()->isRecord()) { 1065 // -- Member function declarations with the same name and the 1066 // same parameter types cannot be overloaded if any of them 1067 // is a static member function declaration. 1068 if (OldMethod->isStatic() || NewMethod->isStatic()) { 1069 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member); 1070 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1071 return true; 1072 } 1073 1074 // C++ [class.mem]p1: 1075 // [...] A member shall not be declared twice in the 1076 // member-specification, except that a nested class or member 1077 // class template can be declared and then later defined. 1078 unsigned NewDiag; 1079 if (isa<CXXConstructorDecl>(OldMethod)) 1080 NewDiag = diag::err_constructor_redeclared; 1081 else if (isa<CXXDestructorDecl>(NewMethod)) 1082 NewDiag = diag::err_destructor_redeclared; 1083 else if (isa<CXXConversionDecl>(NewMethod)) 1084 NewDiag = diag::err_conv_function_redeclared; 1085 else 1086 NewDiag = diag::err_member_redeclared; 1087 1088 Diag(New->getLocation(), NewDiag); 1089 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1090 } else { 1091 if (OldMethod->isImplicit()) { 1092 Diag(NewMethod->getLocation(), 1093 diag::err_definition_of_implicitly_declared_member) 1094 << New << getSpecialMember(Context, OldMethod); 1095 1096 Diag(OldMethod->getLocation(), 1097 diag::note_previous_implicit_declaration); 1098 return true; 1099 } 1100 } 1101 } 1102 1103 // (C++98 8.3.5p3): 1104 // All declarations for a function shall agree exactly in both the 1105 // return type and the parameter-type-list. 1106 // attributes should be ignored when comparing. 1107 if (Context.getNoReturnType(OldQType, false) == 1108 Context.getNoReturnType(NewQType, false)) 1109 return MergeCompatibleFunctionDecls(New, Old); 1110 1111 // Fall through for conflicting redeclarations and redefinitions. 1112 } 1113 1114 // C: Function types need to be compatible, not identical. This handles 1115 // duplicate function decls like "void f(int); void f(enum X);" properly. 1116 if (!getLangOptions().CPlusPlus && 1117 Context.typesAreCompatible(OldQType, NewQType)) { 1118 const FunctionType *OldFuncType = OldQType->getAs<FunctionType>(); 1119 const FunctionType *NewFuncType = NewQType->getAs<FunctionType>(); 1120 const FunctionProtoType *OldProto = 0; 1121 if (isa<FunctionNoProtoType>(NewFuncType) && 1122 (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) { 1123 // The old declaration provided a function prototype, but the 1124 // new declaration does not. Merge in the prototype. 1125 assert(!OldProto->hasExceptionSpec() && "Exception spec in C"); 1126 llvm::SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(), 1127 OldProto->arg_type_end()); 1128 NewQType = Context.getFunctionType(NewFuncType->getResultType(), 1129 ParamTypes.data(), ParamTypes.size(), 1130 OldProto->isVariadic(), 1131 OldProto->getTypeQuals(), 1132 false, false, 0, 0, 1133 OldProto->getExtInfo()); 1134 New->setType(NewQType); 1135 New->setHasInheritedPrototype(); 1136 1137 // Synthesize a parameter for each argument type. 1138 llvm::SmallVector<ParmVarDecl*, 16> Params; 1139 for (FunctionProtoType::arg_type_iterator 1140 ParamType = OldProto->arg_type_begin(), 1141 ParamEnd = OldProto->arg_type_end(); 1142 ParamType != ParamEnd; ++ParamType) { 1143 ParmVarDecl *Param = ParmVarDecl::Create(Context, New, 1144 SourceLocation(), 0, 1145 *ParamType, /*TInfo=*/0, 1146 VarDecl::None, 0); 1147 Param->setImplicit(); 1148 Params.push_back(Param); 1149 } 1150 1151 New->setParams(Params.data(), Params.size()); 1152 } 1153 1154 return MergeCompatibleFunctionDecls(New, Old); 1155 } 1156 1157 // GNU C permits a K&R definition to follow a prototype declaration 1158 // if the declared types of the parameters in the K&R definition 1159 // match the types in the prototype declaration, even when the 1160 // promoted types of the parameters from the K&R definition differ 1161 // from the types in the prototype. GCC then keeps the types from 1162 // the prototype. 1163 // 1164 // If a variadic prototype is followed by a non-variadic K&R definition, 1165 // the K&R definition becomes variadic. This is sort of an edge case, but 1166 // it's legal per the standard depending on how you read C99 6.7.5.3p15 and 1167 // C99 6.9.1p8. 1168 if (!getLangOptions().CPlusPlus && 1169 Old->hasPrototype() && !New->hasPrototype() && 1170 New->getType()->getAs<FunctionProtoType>() && 1171 Old->getNumParams() == New->getNumParams()) { 1172 llvm::SmallVector<QualType, 16> ArgTypes; 1173 llvm::SmallVector<GNUCompatibleParamWarning, 16> Warnings; 1174 const FunctionProtoType *OldProto 1175 = Old->getType()->getAs<FunctionProtoType>(); 1176 const FunctionProtoType *NewProto 1177 = New->getType()->getAs<FunctionProtoType>(); 1178 1179 // Determine whether this is the GNU C extension. 1180 QualType MergedReturn = Context.mergeTypes(OldProto->getResultType(), 1181 NewProto->getResultType()); 1182 bool LooseCompatible = !MergedReturn.isNull(); 1183 for (unsigned Idx = 0, End = Old->getNumParams(); 1184 LooseCompatible && Idx != End; ++Idx) { 1185 ParmVarDecl *OldParm = Old->getParamDecl(Idx); 1186 ParmVarDecl *NewParm = New->getParamDecl(Idx); 1187 if (Context.typesAreCompatible(OldParm->getType(), 1188 NewProto->getArgType(Idx))) { 1189 ArgTypes.push_back(NewParm->getType()); 1190 } else if (Context.typesAreCompatible(OldParm->getType(), 1191 NewParm->getType())) { 1192 GNUCompatibleParamWarning Warn 1193 = { OldParm, NewParm, NewProto->getArgType(Idx) }; 1194 Warnings.push_back(Warn); 1195 ArgTypes.push_back(NewParm->getType()); 1196 } else 1197 LooseCompatible = false; 1198 } 1199 1200 if (LooseCompatible) { 1201 for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) { 1202 Diag(Warnings[Warn].NewParm->getLocation(), 1203 diag::ext_param_promoted_not_compatible_with_prototype) 1204 << Warnings[Warn].PromotedType 1205 << Warnings[Warn].OldParm->getType(); 1206 Diag(Warnings[Warn].OldParm->getLocation(), 1207 diag::note_previous_declaration); 1208 } 1209 1210 New->setType(Context.getFunctionType(MergedReturn, &ArgTypes[0], 1211 ArgTypes.size(), 1212 OldProto->isVariadic(), 0, 1213 false, false, 0, 0, 1214 OldProto->getExtInfo())); 1215 return MergeCompatibleFunctionDecls(New, Old); 1216 } 1217 1218 // Fall through to diagnose conflicting types. 1219 } 1220 1221 // A function that has already been declared has been redeclared or defined 1222 // with a different type- show appropriate diagnostic 1223 if (unsigned BuiltinID = Old->getBuiltinID()) { 1224 // The user has declared a builtin function with an incompatible 1225 // signature. 1226 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 1227 // The function the user is redeclaring is a library-defined 1228 // function like 'malloc' or 'printf'. Warn about the 1229 // redeclaration, then pretend that we don't know about this 1230 // library built-in. 1231 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New; 1232 Diag(Old->getLocation(), diag::note_previous_builtin_declaration) 1233 << Old << Old->getType(); 1234 New->getIdentifier()->setBuiltinID(Builtin::NotBuiltin); 1235 Old->setInvalidDecl(); 1236 return false; 1237 } 1238 1239 PrevDiag = diag::note_previous_builtin_declaration; 1240 } 1241 1242 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); 1243 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1244 return true; 1245} 1246 1247/// \brief Completes the merge of two function declarations that are 1248/// known to be compatible. 1249/// 1250/// This routine handles the merging of attributes and other 1251/// properties of function declarations form the old declaration to 1252/// the new declaration, once we know that New is in fact a 1253/// redeclaration of Old. 1254/// 1255/// \returns false 1256bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old) { 1257 // Merge the attributes 1258 MergeAttributes(New, Old, Context); 1259 1260 // Merge the storage class. 1261 if (Old->getStorageClass() != FunctionDecl::Extern && 1262 Old->getStorageClass() != FunctionDecl::None) 1263 New->setStorageClass(Old->getStorageClass()); 1264 1265 // Merge "pure" flag. 1266 if (Old->isPure()) 1267 New->setPure(); 1268 1269 // Merge the "deleted" flag. 1270 if (Old->isDeleted()) 1271 New->setDeleted(); 1272 1273 if (getLangOptions().CPlusPlus) 1274 return MergeCXXFunctionDecl(New, Old); 1275 1276 return false; 1277} 1278 1279/// MergeVarDecl - We just parsed a variable 'New' which has the same name 1280/// and scope as a previous declaration 'Old'. Figure out how to resolve this 1281/// situation, merging decls or emitting diagnostics as appropriate. 1282/// 1283/// Tentative definition rules (C99 6.9.2p2) are checked by 1284/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 1285/// definitions here, since the initializer hasn't been attached. 1286/// 1287void Sema::MergeVarDecl(VarDecl *New, LookupResult &Previous) { 1288 // If the new decl is already invalid, don't do any other checking. 1289 if (New->isInvalidDecl()) 1290 return; 1291 1292 // Verify the old decl was also a variable. 1293 VarDecl *Old = 0; 1294 if (!Previous.isSingleResult() || 1295 !(Old = dyn_cast<VarDecl>(Previous.getFoundDecl()))) { 1296 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1297 << New->getDeclName(); 1298 Diag(Previous.getRepresentativeDecl()->getLocation(), 1299 diag::note_previous_definition); 1300 return New->setInvalidDecl(); 1301 } 1302 1303 MergeAttributes(New, Old, Context); 1304 1305 // Merge the types 1306 QualType MergedT; 1307 if (getLangOptions().CPlusPlus) { 1308 if (Context.hasSameType(New->getType(), Old->getType())) 1309 MergedT = New->getType(); 1310 // C++ [basic.link]p10: 1311 // [...] the types specified by all declarations referring to a given 1312 // object or function shall be identical, except that declarations for an 1313 // array object can specify array types that differ by the presence or 1314 // absence of a major array bound (8.3.4). 1315 else if (Old->getType()->isIncompleteArrayType() && 1316 New->getType()->isArrayType()) { 1317 CanQual<ArrayType> OldArray 1318 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 1319 CanQual<ArrayType> NewArray 1320 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 1321 if (OldArray->getElementType() == NewArray->getElementType()) 1322 MergedT = New->getType(); 1323 } else if (Old->getType()->isArrayType() && 1324 New->getType()->isIncompleteArrayType()) { 1325 CanQual<ArrayType> OldArray 1326 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 1327 CanQual<ArrayType> NewArray 1328 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 1329 if (OldArray->getElementType() == NewArray->getElementType()) 1330 MergedT = Old->getType(); 1331 } 1332 } else { 1333 MergedT = Context.mergeTypes(New->getType(), Old->getType()); 1334 } 1335 if (MergedT.isNull()) { 1336 Diag(New->getLocation(), diag::err_redefinition_different_type) 1337 << New->getDeclName(); 1338 Diag(Old->getLocation(), diag::note_previous_definition); 1339 return New->setInvalidDecl(); 1340 } 1341 New->setType(MergedT); 1342 1343 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 1344 if (New->getStorageClass() == VarDecl::Static && 1345 (Old->getStorageClass() == VarDecl::None || Old->hasExternalStorage())) { 1346 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); 1347 Diag(Old->getLocation(), diag::note_previous_definition); 1348 return New->setInvalidDecl(); 1349 } 1350 // C99 6.2.2p4: 1351 // For an identifier declared with the storage-class specifier 1352 // extern in a scope in which a prior declaration of that 1353 // identifier is visible,23) if the prior declaration specifies 1354 // internal or external linkage, the linkage of the identifier at 1355 // the later declaration is the same as the linkage specified at 1356 // the prior declaration. If no prior declaration is visible, or 1357 // if the prior declaration specifies no linkage, then the 1358 // identifier has external linkage. 1359 if (New->hasExternalStorage() && Old->hasLinkage()) 1360 /* Okay */; 1361 else if (New->getStorageClass() != VarDecl::Static && 1362 Old->getStorageClass() == VarDecl::Static) { 1363 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 1364 Diag(Old->getLocation(), diag::note_previous_definition); 1365 return New->setInvalidDecl(); 1366 } 1367 1368 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. 1369 1370 // FIXME: The test for external storage here seems wrong? We still 1371 // need to check for mismatches. 1372 if (!New->hasExternalStorage() && !New->isFileVarDecl() && 1373 // Don't complain about out-of-line definitions of static members. 1374 !(Old->getLexicalDeclContext()->isRecord() && 1375 !New->getLexicalDeclContext()->isRecord())) { 1376 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 1377 Diag(Old->getLocation(), diag::note_previous_definition); 1378 return New->setInvalidDecl(); 1379 } 1380 1381 if (New->isThreadSpecified() && !Old->isThreadSpecified()) { 1382 Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName(); 1383 Diag(Old->getLocation(), diag::note_previous_definition); 1384 } else if (!New->isThreadSpecified() && Old->isThreadSpecified()) { 1385 Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName(); 1386 Diag(Old->getLocation(), diag::note_previous_definition); 1387 } 1388 1389 // C++ doesn't have tentative definitions, so go right ahead and check here. 1390 const VarDecl *Def; 1391 if (getLangOptions().CPlusPlus && 1392 New->isThisDeclarationADefinition() == VarDecl::Definition && 1393 (Def = Old->getDefinition())) { 1394 Diag(New->getLocation(), diag::err_redefinition) 1395 << New->getDeclName(); 1396 Diag(Def->getLocation(), diag::note_previous_definition); 1397 New->setInvalidDecl(); 1398 return; 1399 } 1400 1401 // Keep a chain of previous declarations. 1402 New->setPreviousDeclaration(Old); 1403 1404 // Inherit access appropriately. 1405 New->setAccess(Old->getAccess()); 1406} 1407 1408/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 1409/// no declarator (e.g. "struct foo;") is parsed. 1410Sema::DeclPtrTy Sema::ParsedFreeStandingDeclSpec(Scope *S, DeclSpec &DS) { 1411 // FIXME: Error on auto/register at file scope 1412 // FIXME: Error on inline/virtual/explicit 1413 // FIXME: Warn on useless __thread 1414 // FIXME: Warn on useless const/volatile 1415 // FIXME: Warn on useless static/extern/typedef/private_extern/mutable 1416 // FIXME: Warn on useless attributes 1417 Decl *TagD = 0; 1418 TagDecl *Tag = 0; 1419 if (DS.getTypeSpecType() == DeclSpec::TST_class || 1420 DS.getTypeSpecType() == DeclSpec::TST_struct || 1421 DS.getTypeSpecType() == DeclSpec::TST_union || 1422 DS.getTypeSpecType() == DeclSpec::TST_enum) { 1423 TagD = static_cast<Decl *>(DS.getTypeRep()); 1424 1425 if (!TagD) // We probably had an error 1426 return DeclPtrTy(); 1427 1428 // Note that the above type specs guarantee that the 1429 // type rep is a Decl, whereas in many of the others 1430 // it's a Type. 1431 Tag = dyn_cast<TagDecl>(TagD); 1432 } 1433 1434 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 1435 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 1436 // or incomplete types shall not be restrict-qualified." 1437 if (TypeQuals & DeclSpec::TQ_restrict) 1438 Diag(DS.getRestrictSpecLoc(), 1439 diag::err_typecheck_invalid_restrict_not_pointer_noarg) 1440 << DS.getSourceRange(); 1441 } 1442 1443 if (DS.isFriendSpecified()) { 1444 // If we're dealing with a class template decl, assume that the 1445 // template routines are handling it. 1446 if (TagD && isa<ClassTemplateDecl>(TagD)) 1447 return DeclPtrTy(); 1448 return ActOnFriendTypeDecl(S, DS, MultiTemplateParamsArg(*this, 0, 0)); 1449 } 1450 1451 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { 1452 // If there are attributes in the DeclSpec, apply them to the record. 1453 if (const AttributeList *AL = DS.getAttributes()) 1454 ProcessDeclAttributeList(S, Record, AL); 1455 1456 if (!Record->getDeclName() && Record->isDefinition() && 1457 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) { 1458 if (getLangOptions().CPlusPlus || 1459 Record->getDeclContext()->isRecord()) 1460 return BuildAnonymousStructOrUnion(S, DS, Record); 1461 1462 Diag(DS.getSourceRange().getBegin(), diag::err_no_declarators) 1463 << DS.getSourceRange(); 1464 } 1465 1466 // Microsoft allows unnamed struct/union fields. Don't complain 1467 // about them. 1468 // FIXME: Should we support Microsoft's extensions in this area? 1469 if (Record->getDeclName() && getLangOptions().Microsoft) 1470 return DeclPtrTy::make(Tag); 1471 } 1472 1473 if (!DS.isMissingDeclaratorOk() && 1474 DS.getTypeSpecType() != DeclSpec::TST_error) { 1475 // Warn about typedefs of enums without names, since this is an 1476 // extension in both Microsoft an GNU. 1477 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef && 1478 Tag && isa<EnumDecl>(Tag)) { 1479 Diag(DS.getSourceRange().getBegin(), diag::ext_typedef_without_a_name) 1480 << DS.getSourceRange(); 1481 return DeclPtrTy::make(Tag); 1482 } 1483 1484 Diag(DS.getSourceRange().getBegin(), diag::err_no_declarators) 1485 << DS.getSourceRange(); 1486 return DeclPtrTy(); 1487 } 1488 1489 return DeclPtrTy::make(Tag); 1490} 1491 1492/// We are trying to inject an anonymous member into the given scope; 1493/// check if there's an existing declaration that can't be overloaded. 1494/// 1495/// \return true if this is a forbidden redeclaration 1496static bool CheckAnonMemberRedeclaration(Sema &SemaRef, 1497 Scope *S, 1498 DeclContext *Owner, 1499 DeclarationName Name, 1500 SourceLocation NameLoc, 1501 unsigned diagnostic) { 1502 LookupResult R(SemaRef, Name, NameLoc, Sema::LookupMemberName, 1503 Sema::ForRedeclaration); 1504 if (!SemaRef.LookupName(R, S)) return false; 1505 1506 if (R.getAsSingle<TagDecl>()) 1507 return false; 1508 1509 // Pick a representative declaration. 1510 NamedDecl *PrevDecl = R.getRepresentativeDecl()->getUnderlyingDecl(); 1511 if (PrevDecl && Owner->isRecord()) { 1512 RecordDecl *Record = cast<RecordDecl>(Owner); 1513 if (!SemaRef.isDeclInScope(PrevDecl, Record, S)) 1514 return false; 1515 } 1516 1517 SemaRef.Diag(NameLoc, diagnostic) << Name; 1518 SemaRef.Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 1519 1520 return true; 1521} 1522 1523/// InjectAnonymousStructOrUnionMembers - Inject the members of the 1524/// anonymous struct or union AnonRecord into the owning context Owner 1525/// and scope S. This routine will be invoked just after we realize 1526/// that an unnamed union or struct is actually an anonymous union or 1527/// struct, e.g., 1528/// 1529/// @code 1530/// union { 1531/// int i; 1532/// float f; 1533/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 1534/// // f into the surrounding scope.x 1535/// @endcode 1536/// 1537/// This routine is recursive, injecting the names of nested anonymous 1538/// structs/unions into the owning context and scope as well. 1539bool Sema::InjectAnonymousStructOrUnionMembers(Scope *S, DeclContext *Owner, 1540 RecordDecl *AnonRecord) { 1541 unsigned diagKind 1542 = AnonRecord->isUnion() ? diag::err_anonymous_union_member_redecl 1543 : diag::err_anonymous_struct_member_redecl; 1544 1545 bool Invalid = false; 1546 for (RecordDecl::field_iterator F = AnonRecord->field_begin(), 1547 FEnd = AnonRecord->field_end(); 1548 F != FEnd; ++F) { 1549 if ((*F)->getDeclName()) { 1550 if (CheckAnonMemberRedeclaration(*this, S, Owner, (*F)->getDeclName(), 1551 (*F)->getLocation(), diagKind)) { 1552 // C++ [class.union]p2: 1553 // The names of the members of an anonymous union shall be 1554 // distinct from the names of any other entity in the 1555 // scope in which the anonymous union is declared. 1556 Invalid = true; 1557 } else { 1558 // C++ [class.union]p2: 1559 // For the purpose of name lookup, after the anonymous union 1560 // definition, the members of the anonymous union are 1561 // considered to have been defined in the scope in which the 1562 // anonymous union is declared. 1563 Owner->makeDeclVisibleInContext(*F); 1564 S->AddDecl(DeclPtrTy::make(*F)); 1565 IdResolver.AddDecl(*F); 1566 } 1567 } else if (const RecordType *InnerRecordType 1568 = (*F)->getType()->getAs<RecordType>()) { 1569 RecordDecl *InnerRecord = InnerRecordType->getDecl(); 1570 if (InnerRecord->isAnonymousStructOrUnion()) 1571 Invalid = Invalid || 1572 InjectAnonymousStructOrUnionMembers(S, Owner, InnerRecord); 1573 } 1574 } 1575 1576 return Invalid; 1577} 1578 1579/// ActOnAnonymousStructOrUnion - Handle the declaration of an 1580/// anonymous structure or union. Anonymous unions are a C++ feature 1581/// (C++ [class.union]) and a GNU C extension; anonymous structures 1582/// are a GNU C and GNU C++ extension. 1583Sema::DeclPtrTy Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 1584 RecordDecl *Record) { 1585 DeclContext *Owner = Record->getDeclContext(); 1586 1587 // Diagnose whether this anonymous struct/union is an extension. 1588 if (Record->isUnion() && !getLangOptions().CPlusPlus) 1589 Diag(Record->getLocation(), diag::ext_anonymous_union); 1590 else if (!Record->isUnion()) 1591 Diag(Record->getLocation(), diag::ext_anonymous_struct); 1592 1593 // C and C++ require different kinds of checks for anonymous 1594 // structs/unions. 1595 bool Invalid = false; 1596 if (getLangOptions().CPlusPlus) { 1597 const char* PrevSpec = 0; 1598 unsigned DiagID; 1599 // C++ [class.union]p3: 1600 // Anonymous unions declared in a named namespace or in the 1601 // global namespace shall be declared static. 1602 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 1603 (isa<TranslationUnitDecl>(Owner) || 1604 (isa<NamespaceDecl>(Owner) && 1605 cast<NamespaceDecl>(Owner)->getDeclName()))) { 1606 Diag(Record->getLocation(), diag::err_anonymous_union_not_static); 1607 Invalid = true; 1608 1609 // Recover by adding 'static'. 1610 DS.SetStorageClassSpec(DeclSpec::SCS_static, SourceLocation(), 1611 PrevSpec, DiagID); 1612 } 1613 // C++ [class.union]p3: 1614 // A storage class is not allowed in a declaration of an 1615 // anonymous union in a class scope. 1616 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 1617 isa<RecordDecl>(Owner)) { 1618 Diag(DS.getStorageClassSpecLoc(), 1619 diag::err_anonymous_union_with_storage_spec); 1620 Invalid = true; 1621 1622 // Recover by removing the storage specifier. 1623 DS.SetStorageClassSpec(DeclSpec::SCS_unspecified, SourceLocation(), 1624 PrevSpec, DiagID); 1625 } 1626 1627 // C++ [class.union]p2: 1628 // The member-specification of an anonymous union shall only 1629 // define non-static data members. [Note: nested types and 1630 // functions cannot be declared within an anonymous union. ] 1631 for (DeclContext::decl_iterator Mem = Record->decls_begin(), 1632 MemEnd = Record->decls_end(); 1633 Mem != MemEnd; ++Mem) { 1634 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 1635 // C++ [class.union]p3: 1636 // An anonymous union shall not have private or protected 1637 // members (clause 11). 1638 if (FD->getAccess() == AS_protected || FD->getAccess() == AS_private) { 1639 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 1640 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 1641 Invalid = true; 1642 } 1643 } else if ((*Mem)->isImplicit()) { 1644 // Any implicit members are fine. 1645 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 1646 // This is a type that showed up in an 1647 // elaborated-type-specifier inside the anonymous struct or 1648 // union, but which actually declares a type outside of the 1649 // anonymous struct or union. It's okay. 1650 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 1651 if (!MemRecord->isAnonymousStructOrUnion() && 1652 MemRecord->getDeclName()) { 1653 // This is a nested type declaration. 1654 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 1655 << (int)Record->isUnion(); 1656 Invalid = true; 1657 } 1658 } else { 1659 // We have something that isn't a non-static data 1660 // member. Complain about it. 1661 unsigned DK = diag::err_anonymous_record_bad_member; 1662 if (isa<TypeDecl>(*Mem)) 1663 DK = diag::err_anonymous_record_with_type; 1664 else if (isa<FunctionDecl>(*Mem)) 1665 DK = diag::err_anonymous_record_with_function; 1666 else if (isa<VarDecl>(*Mem)) 1667 DK = diag::err_anonymous_record_with_static; 1668 Diag((*Mem)->getLocation(), DK) 1669 << (int)Record->isUnion(); 1670 Invalid = true; 1671 } 1672 } 1673 } 1674 1675 if (!Record->isUnion() && !Owner->isRecord()) { 1676 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 1677 << (int)getLangOptions().CPlusPlus; 1678 Invalid = true; 1679 } 1680 1681 // Mock up a declarator. 1682 Declarator Dc(DS, Declarator::TypeNameContext); 1683 TypeSourceInfo *TInfo = 0; 1684 GetTypeForDeclarator(Dc, S, &TInfo); 1685 assert(TInfo && "couldn't build declarator info for anonymous struct/union"); 1686 1687 // Create a declaration for this anonymous struct/union. 1688 NamedDecl *Anon = 0; 1689 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 1690 Anon = FieldDecl::Create(Context, OwningClass, Record->getLocation(), 1691 /*IdentifierInfo=*/0, 1692 Context.getTypeDeclType(Record), 1693 TInfo, 1694 /*BitWidth=*/0, /*Mutable=*/false); 1695 Anon->setAccess(AS_public); 1696 if (getLangOptions().CPlusPlus) 1697 FieldCollector->Add(cast<FieldDecl>(Anon)); 1698 } else { 1699 VarDecl::StorageClass SC; 1700 switch (DS.getStorageClassSpec()) { 1701 default: assert(0 && "Unknown storage class!"); 1702 case DeclSpec::SCS_unspecified: SC = VarDecl::None; break; 1703 case DeclSpec::SCS_extern: SC = VarDecl::Extern; break; 1704 case DeclSpec::SCS_static: SC = VarDecl::Static; break; 1705 case DeclSpec::SCS_auto: SC = VarDecl::Auto; break; 1706 case DeclSpec::SCS_register: SC = VarDecl::Register; break; 1707 case DeclSpec::SCS_private_extern: SC = VarDecl::PrivateExtern; break; 1708 case DeclSpec::SCS_mutable: 1709 // mutable can only appear on non-static class members, so it's always 1710 // an error here 1711 Diag(Record->getLocation(), diag::err_mutable_nonmember); 1712 Invalid = true; 1713 SC = VarDecl::None; 1714 break; 1715 } 1716 1717 Anon = VarDecl::Create(Context, Owner, Record->getLocation(), 1718 /*IdentifierInfo=*/0, 1719 Context.getTypeDeclType(Record), 1720 TInfo, 1721 SC); 1722 } 1723 Anon->setImplicit(); 1724 1725 // Add the anonymous struct/union object to the current 1726 // context. We'll be referencing this object when we refer to one of 1727 // its members. 1728 Owner->addDecl(Anon); 1729 1730 // Inject the members of the anonymous struct/union into the owning 1731 // context and into the identifier resolver chain for name lookup 1732 // purposes. 1733 if (InjectAnonymousStructOrUnionMembers(S, Owner, Record)) 1734 Invalid = true; 1735 1736 // Mark this as an anonymous struct/union type. Note that we do not 1737 // do this until after we have already checked and injected the 1738 // members of this anonymous struct/union type, because otherwise 1739 // the members could be injected twice: once by DeclContext when it 1740 // builds its lookup table, and once by 1741 // InjectAnonymousStructOrUnionMembers. 1742 Record->setAnonymousStructOrUnion(true); 1743 1744 if (Invalid) 1745 Anon->setInvalidDecl(); 1746 1747 return DeclPtrTy::make(Anon); 1748} 1749 1750 1751/// GetNameForDeclarator - Determine the full declaration name for the 1752/// given Declarator. 1753DeclarationName Sema::GetNameForDeclarator(Declarator &D) { 1754 return GetNameFromUnqualifiedId(D.getName()); 1755} 1756 1757/// \brief Retrieves the canonicalized name from a parsed unqualified-id. 1758DeclarationName Sema::GetNameFromUnqualifiedId(const UnqualifiedId &Name) { 1759 switch (Name.getKind()) { 1760 case UnqualifiedId::IK_Identifier: 1761 return DeclarationName(Name.Identifier); 1762 1763 case UnqualifiedId::IK_OperatorFunctionId: 1764 return Context.DeclarationNames.getCXXOperatorName( 1765 Name.OperatorFunctionId.Operator); 1766 1767 case UnqualifiedId::IK_LiteralOperatorId: 1768 return Context.DeclarationNames.getCXXLiteralOperatorName( 1769 Name.Identifier); 1770 1771 case UnqualifiedId::IK_ConversionFunctionId: { 1772 QualType Ty = GetTypeFromParser(Name.ConversionFunctionId); 1773 if (Ty.isNull()) 1774 return DeclarationName(); 1775 1776 return Context.DeclarationNames.getCXXConversionFunctionName( 1777 Context.getCanonicalType(Ty)); 1778 } 1779 1780 case UnqualifiedId::IK_ConstructorName: { 1781 QualType Ty = GetTypeFromParser(Name.ConstructorName); 1782 if (Ty.isNull()) 1783 return DeclarationName(); 1784 1785 return Context.DeclarationNames.getCXXConstructorName( 1786 Context.getCanonicalType(Ty)); 1787 } 1788 1789 case UnqualifiedId::IK_ConstructorTemplateId: { 1790 // In well-formed code, we can only have a constructor 1791 // template-id that refers to the current context, so go there 1792 // to find the actual type being constructed. 1793 CXXRecordDecl *CurClass = dyn_cast<CXXRecordDecl>(CurContext); 1794 if (!CurClass || CurClass->getIdentifier() != Name.TemplateId->Name) 1795 return DeclarationName(); 1796 1797 // Determine the type of the class being constructed. 1798 QualType CurClassType = Context.getTypeDeclType(CurClass); 1799 1800 // FIXME: Check two things: that the template-id names the same type as 1801 // CurClassType, and that the template-id does not occur when the name 1802 // was qualified. 1803 1804 return Context.DeclarationNames.getCXXConstructorName( 1805 Context.getCanonicalType(CurClassType)); 1806 } 1807 1808 case UnqualifiedId::IK_DestructorName: { 1809 QualType Ty = GetTypeFromParser(Name.DestructorName); 1810 if (Ty.isNull()) 1811 return DeclarationName(); 1812 1813 return Context.DeclarationNames.getCXXDestructorName( 1814 Context.getCanonicalType(Ty)); 1815 } 1816 1817 case UnqualifiedId::IK_TemplateId: { 1818 TemplateName TName 1819 = TemplateName::getFromVoidPointer(Name.TemplateId->Template); 1820 return Context.getNameForTemplate(TName); 1821 } 1822 } 1823 1824 assert(false && "Unknown name kind"); 1825 return DeclarationName(); 1826} 1827 1828/// isNearlyMatchingFunction - Determine whether the C++ functions 1829/// Declaration and Definition are "nearly" matching. This heuristic 1830/// is used to improve diagnostics in the case where an out-of-line 1831/// function definition doesn't match any declaration within 1832/// the class or namespace. 1833static bool isNearlyMatchingFunction(ASTContext &Context, 1834 FunctionDecl *Declaration, 1835 FunctionDecl *Definition) { 1836 if (Declaration->param_size() != Definition->param_size()) 1837 return false; 1838 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 1839 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 1840 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 1841 1842 if (!Context.hasSameUnqualifiedType(DeclParamTy.getNonReferenceType(), 1843 DefParamTy.getNonReferenceType())) 1844 return false; 1845 } 1846 1847 return true; 1848} 1849 1850Sema::DeclPtrTy 1851Sema::HandleDeclarator(Scope *S, Declarator &D, 1852 MultiTemplateParamsArg TemplateParamLists, 1853 bool IsFunctionDefinition) { 1854 DeclarationName Name = GetNameForDeclarator(D); 1855 1856 // All of these full declarators require an identifier. If it doesn't have 1857 // one, the ParsedFreeStandingDeclSpec action should be used. 1858 if (!Name) { 1859 if (!D.isInvalidType()) // Reject this if we think it is valid. 1860 Diag(D.getDeclSpec().getSourceRange().getBegin(), 1861 diag::err_declarator_need_ident) 1862 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 1863 return DeclPtrTy(); 1864 } 1865 1866 // The scope passed in may not be a decl scope. Zip up the scope tree until 1867 // we find one that is. 1868 while ((S->getFlags() & Scope::DeclScope) == 0 || 1869 (S->getFlags() & Scope::TemplateParamScope) != 0) 1870 S = S->getParent(); 1871 1872 // If this is an out-of-line definition of a member of a class template 1873 // or class template partial specialization, we may need to rebuild the 1874 // type specifier in the declarator. See RebuildTypeInCurrentInstantiation() 1875 // for more information. 1876 // FIXME: cope with decltype(expr) and typeof(expr) once the rebuilder can 1877 // handle expressions properly. 1878 DeclSpec &DS = const_cast<DeclSpec&>(D.getDeclSpec()); 1879 if (D.getCXXScopeSpec().isSet() && !D.getCXXScopeSpec().isInvalid() && 1880 isDependentScopeSpecifier(D.getCXXScopeSpec()) && 1881 (DS.getTypeSpecType() == DeclSpec::TST_typename || 1882 DS.getTypeSpecType() == DeclSpec::TST_typeofType || 1883 DS.getTypeSpecType() == DeclSpec::TST_typeofExpr || 1884 DS.getTypeSpecType() == DeclSpec::TST_decltype)) { 1885 if (DeclContext *DC = computeDeclContext(D.getCXXScopeSpec(), true)) { 1886 // FIXME: Preserve type source info. 1887 QualType T = GetTypeFromParser(DS.getTypeRep()); 1888 1889 DeclContext *SavedContext = CurContext; 1890 CurContext = DC; 1891 T = RebuildTypeInCurrentInstantiation(T, D.getIdentifierLoc(), Name); 1892 CurContext = SavedContext; 1893 1894 if (T.isNull()) 1895 return DeclPtrTy(); 1896 DS.UpdateTypeRep(T.getAsOpaquePtr()); 1897 } 1898 } 1899 1900 DeclContext *DC; 1901 NamedDecl *New; 1902 1903 TypeSourceInfo *TInfo = 0; 1904 QualType R = GetTypeForDeclarator(D, S, &TInfo); 1905 1906 LookupResult Previous(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName, 1907 ForRedeclaration); 1908 1909 // See if this is a redefinition of a variable in the same scope. 1910 if (D.getCXXScopeSpec().isInvalid()) { 1911 DC = CurContext; 1912 D.setInvalidType(); 1913 } else if (!D.getCXXScopeSpec().isSet()) { 1914 bool IsLinkageLookup = false; 1915 1916 // If the declaration we're planning to build will be a function 1917 // or object with linkage, then look for another declaration with 1918 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 1919 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 1920 /* Do nothing*/; 1921 else if (R->isFunctionType()) { 1922 if (CurContext->isFunctionOrMethod() || 1923 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 1924 IsLinkageLookup = true; 1925 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 1926 IsLinkageLookup = true; 1927 else if (CurContext->getLookupContext()->isTranslationUnit() && 1928 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 1929 IsLinkageLookup = true; 1930 1931 if (IsLinkageLookup) 1932 Previous.clear(LookupRedeclarationWithLinkage); 1933 1934 DC = CurContext; 1935 LookupName(Previous, S, /* CreateBuiltins = */ IsLinkageLookup); 1936 } else { // Something like "int foo::x;" 1937 DC = computeDeclContext(D.getCXXScopeSpec(), true); 1938 1939 if (!DC) { 1940 // If we could not compute the declaration context, it's because the 1941 // declaration context is dependent but does not refer to a class, 1942 // class template, or class template partial specialization. Complain 1943 // and return early, to avoid the coming semantic disaster. 1944 Diag(D.getIdentifierLoc(), 1945 diag::err_template_qualified_declarator_no_match) 1946 << (NestedNameSpecifier*)D.getCXXScopeSpec().getScopeRep() 1947 << D.getCXXScopeSpec().getRange(); 1948 return DeclPtrTy(); 1949 } 1950 1951 if (!DC->isDependentContext() && 1952 RequireCompleteDeclContext(D.getCXXScopeSpec())) 1953 return DeclPtrTy(); 1954 1955 if (isa<CXXRecordDecl>(DC) && !cast<CXXRecordDecl>(DC)->hasDefinition()) { 1956 Diag(D.getIdentifierLoc(), 1957 diag::err_member_def_undefined_record) 1958 << Name << DC << D.getCXXScopeSpec().getRange(); 1959 D.setInvalidType(); 1960 } 1961 1962 LookupQualifiedName(Previous, DC); 1963 1964 // Don't consider using declarations as previous declarations for 1965 // out-of-line members. 1966 RemoveUsingDecls(Previous); 1967 1968 // C++ 7.3.1.2p2: 1969 // Members (including explicit specializations of templates) of a named 1970 // namespace can also be defined outside that namespace by explicit 1971 // qualification of the name being defined, provided that the entity being 1972 // defined was already declared in the namespace and the definition appears 1973 // after the point of declaration in a namespace that encloses the 1974 // declarations namespace. 1975 // 1976 // Note that we only check the context at this point. We don't yet 1977 // have enough information to make sure that PrevDecl is actually 1978 // the declaration we want to match. For example, given: 1979 // 1980 // class X { 1981 // void f(); 1982 // void f(float); 1983 // }; 1984 // 1985 // void X::f(int) { } // ill-formed 1986 // 1987 // In this case, PrevDecl will point to the overload set 1988 // containing the two f's declared in X, but neither of them 1989 // matches. 1990 1991 // First check whether we named the global scope. 1992 if (isa<TranslationUnitDecl>(DC)) { 1993 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope) 1994 << Name << D.getCXXScopeSpec().getRange(); 1995 } else { 1996 DeclContext *Cur = CurContext; 1997 while (isa<LinkageSpecDecl>(Cur)) 1998 Cur = Cur->getParent(); 1999 if (!Cur->Encloses(DC)) { 2000 // The qualifying scope doesn't enclose the original declaration. 2001 // Emit diagnostic based on current scope. 2002 SourceLocation L = D.getIdentifierLoc(); 2003 SourceRange R = D.getCXXScopeSpec().getRange(); 2004 if (isa<FunctionDecl>(Cur)) 2005 Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 2006 else 2007 Diag(L, diag::err_invalid_declarator_scope) 2008 << Name << cast<NamedDecl>(DC) << R; 2009 D.setInvalidType(); 2010 } 2011 } 2012 } 2013 2014 if (Previous.isSingleResult() && 2015 Previous.getFoundDecl()->isTemplateParameter()) { 2016 // Maybe we will complain about the shadowed template parameter. 2017 if (!D.isInvalidType()) 2018 if (DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), 2019 Previous.getFoundDecl())) 2020 D.setInvalidType(); 2021 2022 // Just pretend that we didn't see the previous declaration. 2023 Previous.clear(); 2024 } 2025 2026 // In C++, the previous declaration we find might be a tag type 2027 // (class or enum). In this case, the new declaration will hide the 2028 // tag type. Note that this does does not apply if we're declaring a 2029 // typedef (C++ [dcl.typedef]p4). 2030 if (Previous.isSingleTagDecl() && 2031 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 2032 Previous.clear(); 2033 2034 bool Redeclaration = false; 2035 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 2036 if (TemplateParamLists.size()) { 2037 Diag(D.getIdentifierLoc(), diag::err_template_typedef); 2038 return DeclPtrTy(); 2039 } 2040 2041 New = ActOnTypedefDeclarator(S, D, DC, R, TInfo, Previous, Redeclaration); 2042 } else if (R->isFunctionType()) { 2043 New = ActOnFunctionDeclarator(S, D, DC, R, TInfo, Previous, 2044 move(TemplateParamLists), 2045 IsFunctionDefinition, Redeclaration); 2046 } else { 2047 New = ActOnVariableDeclarator(S, D, DC, R, TInfo, Previous, 2048 move(TemplateParamLists), 2049 Redeclaration); 2050 } 2051 2052 if (New == 0) 2053 return DeclPtrTy(); 2054 2055 // If this has an identifier and is not an invalid redeclaration or 2056 // function template specialization, add it to the scope stack. 2057 if (Name && !(Redeclaration && New->isInvalidDecl())) 2058 PushOnScopeChains(New, S); 2059 2060 return DeclPtrTy::make(New); 2061} 2062 2063/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 2064/// types into constant array types in certain situations which would otherwise 2065/// be errors (for GCC compatibility). 2066static QualType TryToFixInvalidVariablyModifiedType(QualType T, 2067 ASTContext &Context, 2068 bool &SizeIsNegative) { 2069 // This method tries to turn a variable array into a constant 2070 // array even when the size isn't an ICE. This is necessary 2071 // for compatibility with code that depends on gcc's buggy 2072 // constant expression folding, like struct {char x[(int)(char*)2];} 2073 SizeIsNegative = false; 2074 2075 QualifierCollector Qs; 2076 const Type *Ty = Qs.strip(T); 2077 2078 if (const PointerType* PTy = dyn_cast<PointerType>(Ty)) { 2079 QualType Pointee = PTy->getPointeeType(); 2080 QualType FixedType = 2081 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative); 2082 if (FixedType.isNull()) return FixedType; 2083 FixedType = Context.getPointerType(FixedType); 2084 return Qs.apply(FixedType); 2085 } 2086 2087 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 2088 if (!VLATy) 2089 return QualType(); 2090 // FIXME: We should probably handle this case 2091 if (VLATy->getElementType()->isVariablyModifiedType()) 2092 return QualType(); 2093 2094 Expr::EvalResult EvalResult; 2095 if (!VLATy->getSizeExpr() || 2096 !VLATy->getSizeExpr()->Evaluate(EvalResult, Context) || 2097 !EvalResult.Val.isInt()) 2098 return QualType(); 2099 2100 llvm::APSInt &Res = EvalResult.Val.getInt(); 2101 if (Res >= llvm::APSInt(Res.getBitWidth(), Res.isUnsigned())) { 2102 // TODO: preserve the size expression in declarator info 2103 return Context.getConstantArrayType(VLATy->getElementType(), 2104 Res, ArrayType::Normal, 0); 2105 } 2106 2107 SizeIsNegative = true; 2108 return QualType(); 2109} 2110 2111/// \brief Register the given locally-scoped external C declaration so 2112/// that it can be found later for redeclarations 2113void 2114Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, 2115 const LookupResult &Previous, 2116 Scope *S) { 2117 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 2118 "Decl is not a locally-scoped decl!"); 2119 // Note that we have a locally-scoped external with this name. 2120 LocallyScopedExternalDecls[ND->getDeclName()] = ND; 2121 2122 if (!Previous.isSingleResult()) 2123 return; 2124 2125 NamedDecl *PrevDecl = Previous.getFoundDecl(); 2126 2127 // If there was a previous declaration of this variable, it may be 2128 // in our identifier chain. Update the identifier chain with the new 2129 // declaration. 2130 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) { 2131 // The previous declaration was found on the identifer resolver 2132 // chain, so remove it from its scope. 2133 while (S && !S->isDeclScope(DeclPtrTy::make(PrevDecl))) 2134 S = S->getParent(); 2135 2136 if (S) 2137 S->RemoveDecl(DeclPtrTy::make(PrevDecl)); 2138 } 2139} 2140 2141/// \brief Diagnose function specifiers on a declaration of an identifier that 2142/// does not identify a function. 2143void Sema::DiagnoseFunctionSpecifiers(Declarator& D) { 2144 // FIXME: We should probably indicate the identifier in question to avoid 2145 // confusion for constructs like "inline int a(), b;" 2146 if (D.getDeclSpec().isInlineSpecified()) 2147 Diag(D.getDeclSpec().getInlineSpecLoc(), 2148 diag::err_inline_non_function); 2149 2150 if (D.getDeclSpec().isVirtualSpecified()) 2151 Diag(D.getDeclSpec().getVirtualSpecLoc(), 2152 diag::err_virtual_non_function); 2153 2154 if (D.getDeclSpec().isExplicitSpecified()) 2155 Diag(D.getDeclSpec().getExplicitSpecLoc(), 2156 diag::err_explicit_non_function); 2157} 2158 2159NamedDecl* 2160Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 2161 QualType R, TypeSourceInfo *TInfo, 2162 LookupResult &Previous, bool &Redeclaration) { 2163 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 2164 if (D.getCXXScopeSpec().isSet()) { 2165 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 2166 << D.getCXXScopeSpec().getRange(); 2167 D.setInvalidType(); 2168 // Pretend we didn't see the scope specifier. 2169 DC = CurContext; 2170 Previous.clear(); 2171 } 2172 2173 if (getLangOptions().CPlusPlus) { 2174 // Check that there are no default arguments (C++ only). 2175 CheckExtraCXXDefaultArguments(D); 2176 } 2177 2178 DiagnoseFunctionSpecifiers(D); 2179 2180 if (D.getDeclSpec().isThreadSpecified()) 2181 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 2182 2183 TypedefDecl *NewTD = ParseTypedefDecl(S, D, R, TInfo); 2184 if (!NewTD) return 0; 2185 2186 // Handle attributes prior to checking for duplicates in MergeVarDecl 2187 ProcessDeclAttributes(S, NewTD, D); 2188 2189 // Merge the decl with the existing one if appropriate. If the decl is 2190 // in an outer scope, it isn't the same thing. 2191 FilterLookupForScope(*this, Previous, DC, S, /*ConsiderLinkage*/ false); 2192 if (!Previous.empty()) { 2193 Redeclaration = true; 2194 MergeTypeDefDecl(NewTD, Previous); 2195 } 2196 2197 // C99 6.7.7p2: If a typedef name specifies a variably modified type 2198 // then it shall have block scope. 2199 QualType T = NewTD->getUnderlyingType(); 2200 if (T->isVariablyModifiedType()) { 2201 FunctionNeedsScopeChecking() = true; 2202 2203 if (S->getFnParent() == 0) { 2204 bool SizeIsNegative; 2205 QualType FixedTy = 2206 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative); 2207 if (!FixedTy.isNull()) { 2208 Diag(D.getIdentifierLoc(), diag::warn_illegal_constant_array_size); 2209 NewTD->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(FixedTy)); 2210 } else { 2211 if (SizeIsNegative) 2212 Diag(D.getIdentifierLoc(), diag::err_typecheck_negative_array_size); 2213 else if (T->isVariableArrayType()) 2214 Diag(D.getIdentifierLoc(), diag::err_vla_decl_in_file_scope); 2215 else 2216 Diag(D.getIdentifierLoc(), diag::err_vm_decl_in_file_scope); 2217 NewTD->setInvalidDecl(); 2218 } 2219 } 2220 } 2221 2222 // If this is the C FILE type, notify the AST context. 2223 if (IdentifierInfo *II = NewTD->getIdentifier()) 2224 if (!NewTD->isInvalidDecl() && 2225 NewTD->getDeclContext()->getLookupContext()->isTranslationUnit()) { 2226 if (II->isStr("FILE")) 2227 Context.setFILEDecl(NewTD); 2228 else if (II->isStr("jmp_buf")) 2229 Context.setjmp_bufDecl(NewTD); 2230 else if (II->isStr("sigjmp_buf")) 2231 Context.setsigjmp_bufDecl(NewTD); 2232 } 2233 2234 return NewTD; 2235} 2236 2237/// \brief Determines whether the given declaration is an out-of-scope 2238/// previous declaration. 2239/// 2240/// This routine should be invoked when name lookup has found a 2241/// previous declaration (PrevDecl) that is not in the scope where a 2242/// new declaration by the same name is being introduced. If the new 2243/// declaration occurs in a local scope, previous declarations with 2244/// linkage may still be considered previous declarations (C99 2245/// 6.2.2p4-5, C++ [basic.link]p6). 2246/// 2247/// \param PrevDecl the previous declaration found by name 2248/// lookup 2249/// 2250/// \param DC the context in which the new declaration is being 2251/// declared. 2252/// 2253/// \returns true if PrevDecl is an out-of-scope previous declaration 2254/// for a new delcaration with the same name. 2255static bool 2256isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 2257 ASTContext &Context) { 2258 if (!PrevDecl) 2259 return 0; 2260 2261 if (!PrevDecl->hasLinkage()) 2262 return false; 2263 2264 if (Context.getLangOptions().CPlusPlus) { 2265 // C++ [basic.link]p6: 2266 // If there is a visible declaration of an entity with linkage 2267 // having the same name and type, ignoring entities declared 2268 // outside the innermost enclosing namespace scope, the block 2269 // scope declaration declares that same entity and receives the 2270 // linkage of the previous declaration. 2271 DeclContext *OuterContext = DC->getLookupContext(); 2272 if (!OuterContext->isFunctionOrMethod()) 2273 // This rule only applies to block-scope declarations. 2274 return false; 2275 else { 2276 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 2277 if (PrevOuterContext->isRecord()) 2278 // We found a member function: ignore it. 2279 return false; 2280 else { 2281 // Find the innermost enclosing namespace for the new and 2282 // previous declarations. 2283 while (!OuterContext->isFileContext()) 2284 OuterContext = OuterContext->getParent(); 2285 while (!PrevOuterContext->isFileContext()) 2286 PrevOuterContext = PrevOuterContext->getParent(); 2287 2288 // The previous declaration is in a different namespace, so it 2289 // isn't the same function. 2290 if (OuterContext->getPrimaryContext() != 2291 PrevOuterContext->getPrimaryContext()) 2292 return false; 2293 } 2294 } 2295 } 2296 2297 return true; 2298} 2299 2300static void SetNestedNameSpecifier(DeclaratorDecl *DD, Declarator &D) { 2301 CXXScopeSpec &SS = D.getCXXScopeSpec(); 2302 if (!SS.isSet()) return; 2303 DD->setQualifierInfo(static_cast<NestedNameSpecifier*>(SS.getScopeRep()), 2304 SS.getRange()); 2305} 2306 2307NamedDecl* 2308Sema::ActOnVariableDeclarator(Scope* S, Declarator& D, DeclContext* DC, 2309 QualType R, TypeSourceInfo *TInfo, 2310 LookupResult &Previous, 2311 MultiTemplateParamsArg TemplateParamLists, 2312 bool &Redeclaration) { 2313 DeclarationName Name = GetNameForDeclarator(D); 2314 2315 // Check that there are no default arguments (C++ only). 2316 if (getLangOptions().CPlusPlus) 2317 CheckExtraCXXDefaultArguments(D); 2318 2319 VarDecl *NewVD; 2320 VarDecl::StorageClass SC; 2321 switch (D.getDeclSpec().getStorageClassSpec()) { 2322 default: assert(0 && "Unknown storage class!"); 2323 case DeclSpec::SCS_unspecified: SC = VarDecl::None; break; 2324 case DeclSpec::SCS_extern: SC = VarDecl::Extern; break; 2325 case DeclSpec::SCS_static: SC = VarDecl::Static; break; 2326 case DeclSpec::SCS_auto: SC = VarDecl::Auto; break; 2327 case DeclSpec::SCS_register: SC = VarDecl::Register; break; 2328 case DeclSpec::SCS_private_extern: SC = VarDecl::PrivateExtern; break; 2329 case DeclSpec::SCS_mutable: 2330 // mutable can only appear on non-static class members, so it's always 2331 // an error here 2332 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 2333 D.setInvalidType(); 2334 SC = VarDecl::None; 2335 break; 2336 } 2337 2338 IdentifierInfo *II = Name.getAsIdentifierInfo(); 2339 if (!II) { 2340 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 2341 << Name.getAsString(); 2342 return 0; 2343 } 2344 2345 DiagnoseFunctionSpecifiers(D); 2346 2347 if (!DC->isRecord() && S->getFnParent() == 0) { 2348 // C99 6.9p2: The storage-class specifiers auto and register shall not 2349 // appear in the declaration specifiers in an external declaration. 2350 if (SC == VarDecl::Auto || SC == VarDecl::Register) { 2351 2352 // If this is a register variable with an asm label specified, then this 2353 // is a GNU extension. 2354 if (SC == VarDecl::Register && D.getAsmLabel()) 2355 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register); 2356 else 2357 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 2358 D.setInvalidType(); 2359 } 2360 } 2361 if (DC->isRecord() && !CurContext->isRecord()) { 2362 // This is an out-of-line definition of a static data member. 2363 if (SC == VarDecl::Static) { 2364 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 2365 diag::err_static_out_of_line) 2366 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 2367 } else if (SC == VarDecl::None) 2368 SC = VarDecl::Static; 2369 } 2370 if (SC == VarDecl::Static) { 2371 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) { 2372 if (RD->isLocalClass()) 2373 Diag(D.getIdentifierLoc(), 2374 diag::err_static_data_member_not_allowed_in_local_class) 2375 << Name << RD->getDeclName(); 2376 } 2377 } 2378 2379 // Match up the template parameter lists with the scope specifier, then 2380 // determine whether we have a template or a template specialization. 2381 bool isExplicitSpecialization = false; 2382 if (TemplateParameterList *TemplateParams 2383 = MatchTemplateParametersToScopeSpecifier( 2384 D.getDeclSpec().getSourceRange().getBegin(), 2385 D.getCXXScopeSpec(), 2386 (TemplateParameterList**)TemplateParamLists.get(), 2387 TemplateParamLists.size(), 2388 isExplicitSpecialization)) { 2389 if (TemplateParams->size() > 0) { 2390 // There is no such thing as a variable template. 2391 Diag(D.getIdentifierLoc(), diag::err_template_variable) 2392 << II 2393 << SourceRange(TemplateParams->getTemplateLoc(), 2394 TemplateParams->getRAngleLoc()); 2395 return 0; 2396 } else { 2397 // There is an extraneous 'template<>' for this variable. Complain 2398 // about it, but allow the declaration of the variable. 2399 Diag(TemplateParams->getTemplateLoc(), 2400 diag::err_template_variable_noparams) 2401 << II 2402 << SourceRange(TemplateParams->getTemplateLoc(), 2403 TemplateParams->getRAngleLoc()); 2404 2405 isExplicitSpecialization = true; 2406 } 2407 } 2408 2409 NewVD = VarDecl::Create(Context, DC, D.getIdentifierLoc(), 2410 II, R, TInfo, SC); 2411 2412 if (D.isInvalidType()) 2413 NewVD->setInvalidDecl(); 2414 2415 SetNestedNameSpecifier(NewVD, D); 2416 2417 if (D.getDeclSpec().isThreadSpecified()) { 2418 if (NewVD->hasLocalStorage()) 2419 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global); 2420 else if (!Context.Target.isTLSSupported()) 2421 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported); 2422 else 2423 NewVD->setThreadSpecified(true); 2424 } 2425 2426 // Set the lexical context. If the declarator has a C++ scope specifier, the 2427 // lexical context will be different from the semantic context. 2428 NewVD->setLexicalDeclContext(CurContext); 2429 2430 // Handle attributes prior to checking for duplicates in MergeVarDecl 2431 ProcessDeclAttributes(S, NewVD, D); 2432 2433 // Handle GNU asm-label extension (encoded as an attribute). 2434 if (Expr *E = (Expr*) D.getAsmLabel()) { 2435 // The parser guarantees this is a string. 2436 StringLiteral *SE = cast<StringLiteral>(E); 2437 NewVD->addAttr(::new (Context) AsmLabelAttr(Context, SE->getString())); 2438 } 2439 2440 // Diagnose shadowed variables before filtering for scope. 2441 if (!D.getCXXScopeSpec().isSet()) 2442 CheckShadow(S, NewVD, Previous); 2443 2444 // Don't consider existing declarations that are in a different 2445 // scope and are out-of-semantic-context declarations (if the new 2446 // declaration has linkage). 2447 FilterLookupForScope(*this, Previous, DC, S, NewVD->hasLinkage()); 2448 2449 // Merge the decl with the existing one if appropriate. 2450 if (!Previous.empty()) { 2451 if (Previous.isSingleResult() && 2452 isa<FieldDecl>(Previous.getFoundDecl()) && 2453 D.getCXXScopeSpec().isSet()) { 2454 // The user tried to define a non-static data member 2455 // out-of-line (C++ [dcl.meaning]p1). 2456 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 2457 << D.getCXXScopeSpec().getRange(); 2458 Previous.clear(); 2459 NewVD->setInvalidDecl(); 2460 } 2461 } else if (D.getCXXScopeSpec().isSet()) { 2462 // No previous declaration in the qualifying scope. 2463 Diag(D.getIdentifierLoc(), diag::err_no_member) 2464 << Name << computeDeclContext(D.getCXXScopeSpec(), true) 2465 << D.getCXXScopeSpec().getRange(); 2466 NewVD->setInvalidDecl(); 2467 } 2468 2469 CheckVariableDeclaration(NewVD, Previous, Redeclaration); 2470 2471 // This is an explicit specialization of a static data member. Check it. 2472 if (isExplicitSpecialization && !NewVD->isInvalidDecl() && 2473 CheckMemberSpecialization(NewVD, Previous)) 2474 NewVD->setInvalidDecl(); 2475 2476 // attributes declared post-definition are currently ignored 2477 if (Previous.isSingleResult()) { 2478 VarDecl *Def = dyn_cast<VarDecl>(Previous.getFoundDecl()); 2479 if (Def && (Def = Def->getDefinition()) && 2480 Def != NewVD && D.hasAttributes()) { 2481 Diag(NewVD->getLocation(), diag::warn_attribute_precede_definition); 2482 Diag(Def->getLocation(), diag::note_previous_definition); 2483 } 2484 } 2485 2486 // If this is a locally-scoped extern C variable, update the map of 2487 // such variables. 2488 if (CurContext->isFunctionOrMethod() && NewVD->isExternC() && 2489 !NewVD->isInvalidDecl()) 2490 RegisterLocallyScopedExternCDecl(NewVD, Previous, S); 2491 2492 return NewVD; 2493} 2494 2495/// \brief Diagnose variable or built-in function shadowing. Implements 2496/// -Wshadow. 2497/// 2498/// This method is called whenever a VarDecl is added to a "useful" 2499/// scope. 2500/// 2501/// \param S the scope in which the shadowing name is being declared 2502/// \param R the lookup of the name 2503/// 2504void Sema::CheckShadow(Scope *S, VarDecl *D, const LookupResult& R) { 2505 // Return if warning is ignored. 2506 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow) == Diagnostic::Ignored) 2507 return; 2508 2509 // Don't diagnose declarations at file scope. The scope might not 2510 // have a DeclContext if (e.g.) we're parsing a function prototype. 2511 DeclContext *NewDC = static_cast<DeclContext*>(S->getEntity()); 2512 if (NewDC && NewDC->isFileContext()) 2513 return; 2514 2515 // Only diagnose if we're shadowing an unambiguous field or variable. 2516 if (R.getResultKind() != LookupResult::Found) 2517 return; 2518 2519 NamedDecl* ShadowedDecl = R.getFoundDecl(); 2520 if (!isa<VarDecl>(ShadowedDecl) && !isa<FieldDecl>(ShadowedDecl)) 2521 return; 2522 2523 DeclContext *OldDC = ShadowedDecl->getDeclContext(); 2524 2525 // Only warn about certain kinds of shadowing for class members. 2526 if (NewDC && NewDC->isRecord()) { 2527 // In particular, don't warn about shadowing non-class members. 2528 if (!OldDC->isRecord()) 2529 return; 2530 2531 // TODO: should we warn about static data members shadowing 2532 // static data members from base classes? 2533 2534 // TODO: don't diagnose for inaccessible shadowed members. 2535 // This is hard to do perfectly because we might friend the 2536 // shadowing context, but that's just a false negative. 2537 } 2538 2539 // Determine what kind of declaration we're shadowing. 2540 unsigned Kind; 2541 if (isa<RecordDecl>(OldDC)) { 2542 if (isa<FieldDecl>(ShadowedDecl)) 2543 Kind = 3; // field 2544 else 2545 Kind = 2; // static data member 2546 } else if (OldDC->isFileContext()) 2547 Kind = 1; // global 2548 else 2549 Kind = 0; // local 2550 2551 DeclarationName Name = R.getLookupName(); 2552 2553 // Emit warning and note. 2554 Diag(R.getNameLoc(), diag::warn_decl_shadow) << Name << Kind << OldDC; 2555 Diag(ShadowedDecl->getLocation(), diag::note_previous_declaration); 2556} 2557 2558/// \brief Check -Wshadow without the advantage of a previous lookup. 2559void Sema::CheckShadow(Scope *S, VarDecl *D) { 2560 LookupResult R(*this, D->getDeclName(), D->getLocation(), 2561 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 2562 LookupName(R, S); 2563 CheckShadow(S, D, R); 2564} 2565 2566/// \brief Perform semantic checking on a newly-created variable 2567/// declaration. 2568/// 2569/// This routine performs all of the type-checking required for a 2570/// variable declaration once it has been built. It is used both to 2571/// check variables after they have been parsed and their declarators 2572/// have been translated into a declaration, and to check variables 2573/// that have been instantiated from a template. 2574/// 2575/// Sets NewVD->isInvalidDecl() if an error was encountered. 2576void Sema::CheckVariableDeclaration(VarDecl *NewVD, 2577 LookupResult &Previous, 2578 bool &Redeclaration) { 2579 // If the decl is already known invalid, don't check it. 2580 if (NewVD->isInvalidDecl()) 2581 return; 2582 2583 QualType T = NewVD->getType(); 2584 2585 if (T->isObjCInterfaceType()) { 2586 Diag(NewVD->getLocation(), diag::err_statically_allocated_object); 2587 return NewVD->setInvalidDecl(); 2588 } 2589 2590 // Emit an error if an address space was applied to decl with local storage. 2591 // This includes arrays of objects with address space qualifiers, but not 2592 // automatic variables that point to other address spaces. 2593 // ISO/IEC TR 18037 S5.1.2 2594 if (NewVD->hasLocalStorage() && (T.getAddressSpace() != 0)) { 2595 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl); 2596 return NewVD->setInvalidDecl(); 2597 } 2598 2599 if (NewVD->hasLocalStorage() && T.isObjCGCWeak() 2600 && !NewVD->hasAttr<BlocksAttr>()) 2601 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local); 2602 2603 bool isVM = T->isVariablyModifiedType(); 2604 if (isVM || NewVD->hasAttr<CleanupAttr>() || 2605 NewVD->hasAttr<BlocksAttr>() || 2606 // FIXME: We need to diagnose jumps passed initialized variables in C++. 2607 // However, this turns on the scope checker for everything with a variable 2608 // which may impact compile time. See if we can find a better solution 2609 // to this, perhaps only checking functions that contain gotos in C++? 2610 (LangOpts.CPlusPlus && NewVD->hasLocalStorage())) 2611 FunctionNeedsScopeChecking() = true; 2612 2613 if ((isVM && NewVD->hasLinkage()) || 2614 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) { 2615 bool SizeIsNegative; 2616 QualType FixedTy = 2617 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative); 2618 2619 if (FixedTy.isNull() && T->isVariableArrayType()) { 2620 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 2621 // FIXME: This won't give the correct result for 2622 // int a[10][n]; 2623 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 2624 2625 if (NewVD->isFileVarDecl()) 2626 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 2627 << SizeRange; 2628 else if (NewVD->getStorageClass() == VarDecl::Static) 2629 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 2630 << SizeRange; 2631 else 2632 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 2633 << SizeRange; 2634 return NewVD->setInvalidDecl(); 2635 } 2636 2637 if (FixedTy.isNull()) { 2638 if (NewVD->isFileVarDecl()) 2639 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 2640 else 2641 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 2642 return NewVD->setInvalidDecl(); 2643 } 2644 2645 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 2646 NewVD->setType(FixedTy); 2647 } 2648 2649 if (Previous.empty() && NewVD->isExternC()) { 2650 // Since we did not find anything by this name and we're declaring 2651 // an extern "C" variable, look for a non-visible extern "C" 2652 // declaration with the same name. 2653 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 2654 = LocallyScopedExternalDecls.find(NewVD->getDeclName()); 2655 if (Pos != LocallyScopedExternalDecls.end()) 2656 Previous.addDecl(Pos->second); 2657 } 2658 2659 if (T->isVoidType() && !NewVD->hasExternalStorage()) { 2660 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 2661 << T; 2662 return NewVD->setInvalidDecl(); 2663 } 2664 2665 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) { 2666 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal); 2667 return NewVD->setInvalidDecl(); 2668 } 2669 2670 if (isVM && NewVD->hasAttr<BlocksAttr>()) { 2671 Diag(NewVD->getLocation(), diag::err_block_on_vm); 2672 return NewVD->setInvalidDecl(); 2673 } 2674 2675 if (!Previous.empty()) { 2676 Redeclaration = true; 2677 MergeVarDecl(NewVD, Previous); 2678 } 2679} 2680 2681/// \brief Data used with FindOverriddenMethod 2682struct FindOverriddenMethodData { 2683 Sema *S; 2684 CXXMethodDecl *Method; 2685}; 2686 2687/// \brief Member lookup function that determines whether a given C++ 2688/// method overrides a method in a base class, to be used with 2689/// CXXRecordDecl::lookupInBases(). 2690static bool FindOverriddenMethod(const CXXBaseSpecifier *Specifier, 2691 CXXBasePath &Path, 2692 void *UserData) { 2693 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 2694 2695 FindOverriddenMethodData *Data 2696 = reinterpret_cast<FindOverriddenMethodData*>(UserData); 2697 2698 DeclarationName Name = Data->Method->getDeclName(); 2699 2700 // FIXME: Do we care about other names here too? 2701 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 2702 // We really want to find the base class constructor here. 2703 QualType T = Data->S->Context.getTypeDeclType(BaseRecord); 2704 CanQualType CT = Data->S->Context.getCanonicalType(T); 2705 2706 Name = Data->S->Context.DeclarationNames.getCXXDestructorName(CT); 2707 } 2708 2709 for (Path.Decls = BaseRecord->lookup(Name); 2710 Path.Decls.first != Path.Decls.second; 2711 ++Path.Decls.first) { 2712 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*Path.Decls.first)) { 2713 if (MD->isVirtual() && !Data->S->IsOverload(Data->Method, MD)) 2714 return true; 2715 } 2716 } 2717 2718 return false; 2719} 2720 2721/// AddOverriddenMethods - See if a method overrides any in the base classes, 2722/// and if so, check that it's a valid override and remember it. 2723void Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 2724 // Look for virtual methods in base classes that this method might override. 2725 CXXBasePaths Paths; 2726 FindOverriddenMethodData Data; 2727 Data.Method = MD; 2728 Data.S = this; 2729 if (DC->lookupInBases(&FindOverriddenMethod, &Data, Paths)) { 2730 for (CXXBasePaths::decl_iterator I = Paths.found_decls_begin(), 2731 E = Paths.found_decls_end(); I != E; ++I) { 2732 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) { 2733 if (!CheckOverridingFunctionReturnType(MD, OldMD) && 2734 !CheckOverridingFunctionExceptionSpec(MD, OldMD) && 2735 !CheckOverridingFunctionAttributes(MD, OldMD)) 2736 MD->addOverriddenMethod(OldMD->getCanonicalDecl()); 2737 } 2738 } 2739 } 2740} 2741 2742NamedDecl* 2743Sema::ActOnFunctionDeclarator(Scope* S, Declarator& D, DeclContext* DC, 2744 QualType R, TypeSourceInfo *TInfo, 2745 LookupResult &Previous, 2746 MultiTemplateParamsArg TemplateParamLists, 2747 bool IsFunctionDefinition, bool &Redeclaration) { 2748 assert(R.getTypePtr()->isFunctionType()); 2749 2750 DeclarationName Name = GetNameForDeclarator(D); 2751 FunctionDecl::StorageClass SC = FunctionDecl::None; 2752 switch (D.getDeclSpec().getStorageClassSpec()) { 2753 default: assert(0 && "Unknown storage class!"); 2754 case DeclSpec::SCS_auto: 2755 case DeclSpec::SCS_register: 2756 case DeclSpec::SCS_mutable: 2757 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 2758 diag::err_typecheck_sclass_func); 2759 D.setInvalidType(); 2760 break; 2761 case DeclSpec::SCS_unspecified: SC = FunctionDecl::None; break; 2762 case DeclSpec::SCS_extern: SC = FunctionDecl::Extern; break; 2763 case DeclSpec::SCS_static: { 2764 if (CurContext->getLookupContext()->isFunctionOrMethod()) { 2765 // C99 6.7.1p5: 2766 // The declaration of an identifier for a function that has 2767 // block scope shall have no explicit storage-class specifier 2768 // other than extern 2769 // See also (C++ [dcl.stc]p4). 2770 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 2771 diag::err_static_block_func); 2772 SC = FunctionDecl::None; 2773 } else 2774 SC = FunctionDecl::Static; 2775 break; 2776 } 2777 case DeclSpec::SCS_private_extern: SC = FunctionDecl::PrivateExtern;break; 2778 } 2779 2780 if (D.getDeclSpec().isThreadSpecified()) 2781 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 2782 2783 bool isFriend = D.getDeclSpec().isFriendSpecified(); 2784 bool isInline = D.getDeclSpec().isInlineSpecified(); 2785 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2786 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 2787 2788 // Check that the return type is not an abstract class type. 2789 // For record types, this is done by the AbstractClassUsageDiagnoser once 2790 // the class has been completely parsed. 2791 if (!DC->isRecord() && 2792 RequireNonAbstractType(D.getIdentifierLoc(), 2793 R->getAs<FunctionType>()->getResultType(), 2794 diag::err_abstract_type_in_decl, 2795 AbstractReturnType)) 2796 D.setInvalidType(); 2797 2798 // Do not allow returning a objc interface by-value. 2799 if (R->getAs<FunctionType>()->getResultType()->isObjCInterfaceType()) { 2800 Diag(D.getIdentifierLoc(), 2801 diag::err_object_cannot_be_passed_returned_by_value) << 0 2802 << R->getAs<FunctionType>()->getResultType(); 2803 D.setInvalidType(); 2804 } 2805 2806 bool isVirtualOkay = false; 2807 FunctionDecl *NewFD; 2808 2809 if (isFriend) { 2810 // C++ [class.friend]p5 2811 // A function can be defined in a friend declaration of a 2812 // class . . . . Such a function is implicitly inline. 2813 isInline |= IsFunctionDefinition; 2814 } 2815 2816 if (Name.getNameKind() == DeclarationName::CXXConstructorName) { 2817 // This is a C++ constructor declaration. 2818 assert(DC->isRecord() && 2819 "Constructors can only be declared in a member context"); 2820 2821 R = CheckConstructorDeclarator(D, R, SC); 2822 2823 // Create the new declaration 2824 NewFD = CXXConstructorDecl::Create(Context, 2825 cast<CXXRecordDecl>(DC), 2826 D.getIdentifierLoc(), Name, R, TInfo, 2827 isExplicit, isInline, 2828 /*isImplicitlyDeclared=*/false); 2829 } else if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 2830 // This is a C++ destructor declaration. 2831 if (DC->isRecord()) { 2832 R = CheckDestructorDeclarator(D, SC); 2833 2834 NewFD = CXXDestructorDecl::Create(Context, 2835 cast<CXXRecordDecl>(DC), 2836 D.getIdentifierLoc(), Name, R, 2837 isInline, 2838 /*isImplicitlyDeclared=*/false); 2839 NewFD->setTypeSourceInfo(TInfo); 2840 2841 isVirtualOkay = true; 2842 } else { 2843 Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 2844 2845 // Create a FunctionDecl to satisfy the function definition parsing 2846 // code path. 2847 NewFD = FunctionDecl::Create(Context, DC, D.getIdentifierLoc(), 2848 Name, R, TInfo, SC, isInline, 2849 /*hasPrototype=*/true); 2850 D.setInvalidType(); 2851 } 2852 } else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName) { 2853 if (!DC->isRecord()) { 2854 Diag(D.getIdentifierLoc(), 2855 diag::err_conv_function_not_member); 2856 return 0; 2857 } 2858 2859 CheckConversionDeclarator(D, R, SC); 2860 NewFD = CXXConversionDecl::Create(Context, cast<CXXRecordDecl>(DC), 2861 D.getIdentifierLoc(), Name, R, TInfo, 2862 isInline, isExplicit); 2863 2864 isVirtualOkay = true; 2865 } else if (DC->isRecord()) { 2866 // If the of the function is the same as the name of the record, then this 2867 // must be an invalid constructor that has a return type. 2868 // (The parser checks for a return type and makes the declarator a 2869 // constructor if it has no return type). 2870 // must have an invalid constructor that has a return type 2871 if (Name.getAsIdentifierInfo() && 2872 Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){ 2873 Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 2874 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2875 << SourceRange(D.getIdentifierLoc()); 2876 return 0; 2877 } 2878 2879 bool isStatic = SC == FunctionDecl::Static; 2880 2881 // [class.free]p1: 2882 // Any allocation function for a class T is a static member 2883 // (even if not explicitly declared static). 2884 if (Name.getCXXOverloadedOperator() == OO_New || 2885 Name.getCXXOverloadedOperator() == OO_Array_New) 2886 isStatic = true; 2887 2888 // [class.free]p6 Any deallocation function for a class X is a static member 2889 // (even if not explicitly declared static). 2890 if (Name.getCXXOverloadedOperator() == OO_Delete || 2891 Name.getCXXOverloadedOperator() == OO_Array_Delete) 2892 isStatic = true; 2893 2894 // This is a C++ method declaration. 2895 NewFD = CXXMethodDecl::Create(Context, cast<CXXRecordDecl>(DC), 2896 D.getIdentifierLoc(), Name, R, TInfo, 2897 isStatic, isInline); 2898 2899 isVirtualOkay = !isStatic; 2900 } else { 2901 // Determine whether the function was written with a 2902 // prototype. This true when: 2903 // - we're in C++ (where every function has a prototype), 2904 // - there is a prototype in the declarator, or 2905 // - the type R of the function is some kind of typedef or other reference 2906 // to a type name (which eventually refers to a function type). 2907 bool HasPrototype = 2908 getLangOptions().CPlusPlus || 2909 (D.getNumTypeObjects() && D.getTypeObject(0).Fun.hasPrototype) || 2910 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType()); 2911 2912 NewFD = FunctionDecl::Create(Context, DC, 2913 D.getIdentifierLoc(), 2914 Name, R, TInfo, SC, isInline, HasPrototype); 2915 } 2916 2917 if (D.isInvalidType()) 2918 NewFD->setInvalidDecl(); 2919 2920 SetNestedNameSpecifier(NewFD, D); 2921 2922 // Set the lexical context. If the declarator has a C++ 2923 // scope specifier, or is the object of a friend declaration, the 2924 // lexical context will be different from the semantic context. 2925 NewFD->setLexicalDeclContext(CurContext); 2926 2927 // Match up the template parameter lists with the scope specifier, then 2928 // determine whether we have a template or a template specialization. 2929 FunctionTemplateDecl *FunctionTemplate = 0; 2930 bool isExplicitSpecialization = false; 2931 bool isFunctionTemplateSpecialization = false; 2932 if (TemplateParameterList *TemplateParams 2933 = MatchTemplateParametersToScopeSpecifier( 2934 D.getDeclSpec().getSourceRange().getBegin(), 2935 D.getCXXScopeSpec(), 2936 (TemplateParameterList**)TemplateParamLists.get(), 2937 TemplateParamLists.size(), 2938 isExplicitSpecialization)) { 2939 if (TemplateParams->size() > 0) { 2940 // This is a function template 2941 2942 // Check that we can declare a template here. 2943 if (CheckTemplateDeclScope(S, TemplateParams)) 2944 return 0; 2945 2946 FunctionTemplate = FunctionTemplateDecl::Create(Context, DC, 2947 NewFD->getLocation(), 2948 Name, TemplateParams, 2949 NewFD); 2950 FunctionTemplate->setLexicalDeclContext(CurContext); 2951 NewFD->setDescribedFunctionTemplate(FunctionTemplate); 2952 } else { 2953 // This is a function template specialization. 2954 isFunctionTemplateSpecialization = true; 2955 2956 // C++0x [temp.expl.spec]p20 forbids "template<> friend void foo(int);". 2957 if (isFriend && isFunctionTemplateSpecialization) { 2958 // We want to remove the "template<>", found here. 2959 SourceRange RemoveRange = TemplateParams->getSourceRange(); 2960 2961 // If we remove the template<> and the name is not a 2962 // template-id, we're actually silently creating a problem: 2963 // the friend declaration will refer to an untemplated decl, 2964 // and clearly the user wants a template specialization. So 2965 // we need to insert '<>' after the name. 2966 SourceLocation InsertLoc; 2967 if (D.getName().getKind() != UnqualifiedId::IK_TemplateId) { 2968 InsertLoc = D.getName().getSourceRange().getEnd(); 2969 InsertLoc = PP.getLocForEndOfToken(InsertLoc); 2970 } 2971 2972 Diag(D.getIdentifierLoc(), diag::err_template_spec_decl_friend) 2973 << Name << RemoveRange 2974 << FixItHint::CreateRemoval(RemoveRange) 2975 << FixItHint::CreateInsertion(InsertLoc, "<>"); 2976 } 2977 } 2978 2979 // FIXME: Free this memory properly. 2980 TemplateParamLists.release(); 2981 } 2982 2983 // C++ [dcl.fct.spec]p5: 2984 // The virtual specifier shall only be used in declarations of 2985 // nonstatic class member functions that appear within a 2986 // member-specification of a class declaration; see 10.3. 2987 // 2988 if (isVirtual && !NewFD->isInvalidDecl()) { 2989 if (!isVirtualOkay) { 2990 Diag(D.getDeclSpec().getVirtualSpecLoc(), 2991 diag::err_virtual_non_function); 2992 } else if (!CurContext->isRecord()) { 2993 // 'virtual' was specified outside of the class. 2994 Diag(D.getDeclSpec().getVirtualSpecLoc(), diag::err_virtual_out_of_class) 2995 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 2996 } else { 2997 // Okay: Add virtual to the method. 2998 CXXRecordDecl *CurClass = cast<CXXRecordDecl>(DC); 2999 CurClass->setMethodAsVirtual(NewFD); 3000 } 3001 } 3002 3003 // C++ [dcl.fct.spec]p6: 3004 // The explicit specifier shall be used only in the declaration of a 3005 // constructor or conversion function within its class definition; see 12.3.1 3006 // and 12.3.2. 3007 if (isExplicit && !NewFD->isInvalidDecl()) { 3008 if (!CurContext->isRecord()) { 3009 // 'explicit' was specified outside of the class. 3010 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3011 diag::err_explicit_out_of_class) 3012 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 3013 } else if (!isa<CXXConstructorDecl>(NewFD) && 3014 !isa<CXXConversionDecl>(NewFD)) { 3015 // 'explicit' was specified on a function that wasn't a constructor 3016 // or conversion function. 3017 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3018 diag::err_explicit_non_ctor_or_conv_function) 3019 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 3020 } 3021 } 3022 3023 // Filter out previous declarations that don't match the scope. 3024 FilterLookupForScope(*this, Previous, DC, S, NewFD->hasLinkage()); 3025 3026 if (isFriend) { 3027 // DC is the namespace in which the function is being declared. 3028 assert((DC->isFileContext() || !Previous.empty()) && 3029 "previously-undeclared friend function being created " 3030 "in a non-namespace context"); 3031 3032 // For now, claim that the objects have no previous declaration. 3033 if (FunctionTemplate) { 3034 FunctionTemplate->setObjectOfFriendDecl(false); 3035 FunctionTemplate->setAccess(AS_public); 3036 } else { 3037 NewFD->setObjectOfFriendDecl(false); 3038 } 3039 3040 NewFD->setAccess(AS_public); 3041 } 3042 3043 if (SC == FunctionDecl::Static && isa<CXXMethodDecl>(NewFD) && 3044 !CurContext->isRecord()) { 3045 // C++ [class.static]p1: 3046 // A data or function member of a class may be declared static 3047 // in a class definition, in which case it is a static member of 3048 // the class. 3049 3050 // Complain about the 'static' specifier if it's on an out-of-line 3051 // member function definition. 3052 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 3053 diag::err_static_out_of_line) 3054 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 3055 } 3056 3057 // Handle GNU asm-label extension (encoded as an attribute). 3058 if (Expr *E = (Expr*) D.getAsmLabel()) { 3059 // The parser guarantees this is a string. 3060 StringLiteral *SE = cast<StringLiteral>(E); 3061 NewFD->addAttr(::new (Context) AsmLabelAttr(Context, SE->getString())); 3062 } 3063 3064 // Copy the parameter declarations from the declarator D to the function 3065 // declaration NewFD, if they are available. First scavenge them into Params. 3066 llvm::SmallVector<ParmVarDecl*, 16> Params; 3067 if (D.getNumTypeObjects() > 0) { 3068 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 3069 3070 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 3071 // function that takes no arguments, not a function that takes a 3072 // single void argument. 3073 // We let through "const void" here because Sema::GetTypeForDeclarator 3074 // already checks for that case. 3075 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 3076 FTI.ArgInfo[0].Param && 3077 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()) { 3078 // Empty arg list, don't push any params. 3079 ParmVarDecl *Param = FTI.ArgInfo[0].Param.getAs<ParmVarDecl>(); 3080 3081 // In C++, the empty parameter-type-list must be spelled "void"; a 3082 // typedef of void is not permitted. 3083 if (getLangOptions().CPlusPlus && 3084 Param->getType().getUnqualifiedType() != Context.VoidTy) 3085 Diag(Param->getLocation(), diag::err_param_typedef_of_void); 3086 // FIXME: Leaks decl? 3087 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 3088 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 3089 ParmVarDecl *Param = FTI.ArgInfo[i].Param.getAs<ParmVarDecl>(); 3090 assert(Param->getDeclContext() != NewFD && "Was set before ?"); 3091 Param->setDeclContext(NewFD); 3092 Params.push_back(Param); 3093 } 3094 } 3095 3096 } else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) { 3097 // When we're declaring a function with a typedef, typeof, etc as in the 3098 // following example, we'll need to synthesize (unnamed) 3099 // parameters for use in the declaration. 3100 // 3101 // @code 3102 // typedef void fn(int); 3103 // fn f; 3104 // @endcode 3105 3106 // Synthesize a parameter for each argument type. 3107 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(), 3108 AE = FT->arg_type_end(); AI != AE; ++AI) { 3109 ParmVarDecl *Param = ParmVarDecl::Create(Context, NewFD, 3110 SourceLocation(), 0, 3111 *AI, /*TInfo=*/0, 3112 VarDecl::None, 0); 3113 Param->setImplicit(); 3114 Params.push_back(Param); 3115 } 3116 } else { 3117 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 && 3118 "Should not need args for typedef of non-prototype fn"); 3119 } 3120 // Finally, we know we have the right number of parameters, install them. 3121 NewFD->setParams(Params.data(), Params.size()); 3122 3123 // If the declarator is a template-id, translate the parser's template 3124 // argument list into our AST format. 3125 bool HasExplicitTemplateArgs = false; 3126 TemplateArgumentListInfo TemplateArgs; 3127 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) { 3128 TemplateIdAnnotation *TemplateId = D.getName().TemplateId; 3129 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc); 3130 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc); 3131 ASTTemplateArgsPtr TemplateArgsPtr(*this, 3132 TemplateId->getTemplateArgs(), 3133 TemplateId->NumArgs); 3134 translateTemplateArguments(TemplateArgsPtr, 3135 TemplateArgs); 3136 TemplateArgsPtr.release(); 3137 3138 HasExplicitTemplateArgs = true; 3139 3140 if (FunctionTemplate) { 3141 // FIXME: Diagnose function template with explicit template 3142 // arguments. 3143 HasExplicitTemplateArgs = false; 3144 } else if (!isFunctionTemplateSpecialization && 3145 !D.getDeclSpec().isFriendSpecified()) { 3146 // We have encountered something that the user meant to be a 3147 // specialization (because it has explicitly-specified template 3148 // arguments) but that was not introduced with a "template<>" (or had 3149 // too few of them). 3150 Diag(D.getIdentifierLoc(), diag::err_template_spec_needs_header) 3151 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc) 3152 << FixItHint::CreateInsertion( 3153 D.getDeclSpec().getSourceRange().getBegin(), 3154 "template<> "); 3155 isFunctionTemplateSpecialization = true; 3156 } else { 3157 // "friend void foo<>(int);" is an implicit specialization decl. 3158 isFunctionTemplateSpecialization = true; 3159 } 3160 } else if (isFriend && isFunctionTemplateSpecialization) { 3161 // This combination is only possible in a recovery case; the user 3162 // wrote something like: 3163 // template <> friend void foo(int); 3164 // which we're recovering from as if the user had written: 3165 // friend void foo<>(int); 3166 // Go ahead and fake up a template id. 3167 HasExplicitTemplateArgs = true; 3168 TemplateArgs.setLAngleLoc(D.getIdentifierLoc()); 3169 TemplateArgs.setRAngleLoc(D.getIdentifierLoc()); 3170 } 3171 3172 // If it's a friend (and only if it's a friend), it's possible 3173 // that either the specialized function type or the specialized 3174 // template is dependent, and therefore matching will fail. In 3175 // this case, don't check the specialization yet. 3176 if (isFunctionTemplateSpecialization && isFriend && 3177 (NewFD->getType()->isDependentType() || DC->isDependentContext())) { 3178 assert(HasExplicitTemplateArgs && 3179 "friend function specialization without template args"); 3180 if (CheckDependentFunctionTemplateSpecialization(NewFD, TemplateArgs, 3181 Previous)) 3182 NewFD->setInvalidDecl(); 3183 } else if (isFunctionTemplateSpecialization) { 3184 if (CheckFunctionTemplateSpecialization(NewFD, 3185 (HasExplicitTemplateArgs ? &TemplateArgs : 0), 3186 Previous)) 3187 NewFD->setInvalidDecl(); 3188 } else if (isExplicitSpecialization && isa<CXXMethodDecl>(NewFD)) { 3189 if (CheckMemberSpecialization(NewFD, Previous)) 3190 NewFD->setInvalidDecl(); 3191 } 3192 3193 // Perform semantic checking on the function declaration. 3194 bool OverloadableAttrRequired = false; // FIXME: HACK! 3195 CheckFunctionDeclaration(S, NewFD, Previous, isExplicitSpecialization, 3196 Redeclaration, /*FIXME:*/OverloadableAttrRequired); 3197 3198 assert((NewFD->isInvalidDecl() || !Redeclaration || 3199 Previous.getResultKind() != LookupResult::FoundOverloaded) && 3200 "previous declaration set still overloaded"); 3201 3202 if (isFriend && Redeclaration) { 3203 AccessSpecifier Access = NewFD->getPreviousDeclaration()->getAccess(); 3204 if (FunctionTemplate) { 3205 FunctionTemplate->setObjectOfFriendDecl(true); 3206 FunctionTemplate->setAccess(Access); 3207 } else { 3208 NewFD->setObjectOfFriendDecl(true); 3209 } 3210 NewFD->setAccess(Access); 3211 } 3212 3213 // If we have a function template, check the template parameter 3214 // list. This will check and merge default template arguments. 3215 if (FunctionTemplate) { 3216 FunctionTemplateDecl *PrevTemplate = FunctionTemplate->getPreviousDeclaration(); 3217 CheckTemplateParameterList(FunctionTemplate->getTemplateParameters(), 3218 PrevTemplate? PrevTemplate->getTemplateParameters() : 0, 3219 D.getDeclSpec().isFriendSpecified()? TPC_FriendFunctionTemplate 3220 : TPC_FunctionTemplate); 3221 } 3222 3223 if (D.getCXXScopeSpec().isSet() && !NewFD->isInvalidDecl()) { 3224 // Fake up an access specifier if it's supposed to be a class member. 3225 if (!Redeclaration && isa<CXXRecordDecl>(NewFD->getDeclContext())) 3226 NewFD->setAccess(AS_public); 3227 3228 // An out-of-line member function declaration must also be a 3229 // definition (C++ [dcl.meaning]p1). 3230 // Note that this is not the case for explicit specializations of 3231 // function templates or member functions of class templates, per 3232 // C++ [temp.expl.spec]p2. 3233 if (!IsFunctionDefinition && !isFriend && 3234 !isFunctionTemplateSpecialization && !isExplicitSpecialization) { 3235 Diag(NewFD->getLocation(), diag::err_out_of_line_declaration) 3236 << D.getCXXScopeSpec().getRange(); 3237 NewFD->setInvalidDecl(); 3238 } else if (!Redeclaration && 3239 !(isFriend && CurContext->isDependentContext())) { 3240 // The user tried to provide an out-of-line definition for a 3241 // function that is a member of a class or namespace, but there 3242 // was no such member function declared (C++ [class.mfct]p2, 3243 // C++ [namespace.memdef]p2). For example: 3244 // 3245 // class X { 3246 // void f() const; 3247 // }; 3248 // 3249 // void X::f() { } // ill-formed 3250 // 3251 // Complain about this problem, and attempt to suggest close 3252 // matches (e.g., those that differ only in cv-qualifiers and 3253 // whether the parameter types are references). 3254 Diag(D.getIdentifierLoc(), diag::err_member_def_does_not_match) 3255 << Name << DC << D.getCXXScopeSpec().getRange(); 3256 NewFD->setInvalidDecl(); 3257 3258 LookupResult Prev(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName, 3259 ForRedeclaration); 3260 LookupQualifiedName(Prev, DC); 3261 assert(!Prev.isAmbiguous() && 3262 "Cannot have an ambiguity in previous-declaration lookup"); 3263 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 3264 Func != FuncEnd; ++Func) { 3265 if (isa<FunctionDecl>(*Func) && 3266 isNearlyMatchingFunction(Context, cast<FunctionDecl>(*Func), NewFD)) 3267 Diag((*Func)->getLocation(), diag::note_member_def_close_match); 3268 } 3269 } 3270 } 3271 3272 // Handle attributes. We need to have merged decls when handling attributes 3273 // (for example to check for conflicts, etc). 3274 // FIXME: This needs to happen before we merge declarations. Then, 3275 // let attribute merging cope with attribute conflicts. 3276 ProcessDeclAttributes(S, NewFD, D); 3277 3278 // attributes declared post-definition are currently ignored 3279 if (Redeclaration && Previous.isSingleResult()) { 3280 const FunctionDecl *Def; 3281 FunctionDecl *PrevFD = dyn_cast<FunctionDecl>(Previous.getFoundDecl()); 3282 if (PrevFD && PrevFD->getBody(Def) && D.hasAttributes()) { 3283 Diag(NewFD->getLocation(), diag::warn_attribute_precede_definition); 3284 Diag(Def->getLocation(), diag::note_previous_definition); 3285 } 3286 } 3287 3288 AddKnownFunctionAttributes(NewFD); 3289 3290 if (OverloadableAttrRequired && !NewFD->getAttr<OverloadableAttr>()) { 3291 // If a function name is overloadable in C, then every function 3292 // with that name must be marked "overloadable". 3293 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 3294 << Redeclaration << NewFD; 3295 if (!Previous.empty()) 3296 Diag(Previous.getRepresentativeDecl()->getLocation(), 3297 diag::note_attribute_overloadable_prev_overload); 3298 NewFD->addAttr(::new (Context) OverloadableAttr()); 3299 } 3300 3301 // If this is a locally-scoped extern C function, update the 3302 // map of such names. 3303 if (CurContext->isFunctionOrMethod() && NewFD->isExternC() 3304 && !NewFD->isInvalidDecl()) 3305 RegisterLocallyScopedExternCDecl(NewFD, Previous, S); 3306 3307 // Set this FunctionDecl's range up to the right paren. 3308 NewFD->setLocEnd(D.getSourceRange().getEnd()); 3309 3310 if (FunctionTemplate && NewFD->isInvalidDecl()) 3311 FunctionTemplate->setInvalidDecl(); 3312 3313 if (FunctionTemplate) 3314 return FunctionTemplate; 3315 3316 3317 // Keep track of static, non-inlined function definitions that 3318 // have not been used. We will warn later. 3319 // FIXME: Also include static functions declared but not defined. 3320 if (!NewFD->isInvalidDecl() && IsFunctionDefinition 3321 && !NewFD->isInlined() && NewFD->getLinkage() == InternalLinkage 3322 && !NewFD->isUsed() && !NewFD->hasAttr<UnusedAttr>()) 3323 UnusedStaticFuncs.push_back(NewFD); 3324 3325 return NewFD; 3326} 3327 3328/// \brief Perform semantic checking of a new function declaration. 3329/// 3330/// Performs semantic analysis of the new function declaration 3331/// NewFD. This routine performs all semantic checking that does not 3332/// require the actual declarator involved in the declaration, and is 3333/// used both for the declaration of functions as they are parsed 3334/// (called via ActOnDeclarator) and for the declaration of functions 3335/// that have been instantiated via C++ template instantiation (called 3336/// via InstantiateDecl). 3337/// 3338/// \param IsExplicitSpecialiation whether this new function declaration is 3339/// an explicit specialization of the previous declaration. 3340/// 3341/// This sets NewFD->isInvalidDecl() to true if there was an error. 3342void Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD, 3343 LookupResult &Previous, 3344 bool IsExplicitSpecialization, 3345 bool &Redeclaration, 3346 bool &OverloadableAttrRequired) { 3347 // If NewFD is already known erroneous, don't do any of this checking. 3348 if (NewFD->isInvalidDecl()) 3349 return; 3350 3351 if (NewFD->getResultType()->isVariablyModifiedType()) { 3352 // Functions returning a variably modified type violate C99 6.7.5.2p2 3353 // because all functions have linkage. 3354 Diag(NewFD->getLocation(), diag::err_vm_func_decl); 3355 return NewFD->setInvalidDecl(); 3356 } 3357 3358 if (NewFD->isMain()) 3359 CheckMain(NewFD); 3360 3361 // Check for a previous declaration of this name. 3362 if (Previous.empty() && NewFD->isExternC()) { 3363 // Since we did not find anything by this name and we're declaring 3364 // an extern "C" function, look for a non-visible extern "C" 3365 // declaration with the same name. 3366 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3367 = LocallyScopedExternalDecls.find(NewFD->getDeclName()); 3368 if (Pos != LocallyScopedExternalDecls.end()) 3369 Previous.addDecl(Pos->second); 3370 } 3371 3372 // Merge or overload the declaration with an existing declaration of 3373 // the same name, if appropriate. 3374 if (!Previous.empty()) { 3375 // Determine whether NewFD is an overload of PrevDecl or 3376 // a declaration that requires merging. If it's an overload, 3377 // there's no more work to do here; we'll just add the new 3378 // function to the scope. 3379 3380 NamedDecl *OldDecl = 0; 3381 if (!AllowOverloadingOfFunction(Previous, Context)) { 3382 Redeclaration = true; 3383 OldDecl = Previous.getFoundDecl(); 3384 } else { 3385 if (!getLangOptions().CPlusPlus) { 3386 OverloadableAttrRequired = true; 3387 3388 // Functions marked "overloadable" must have a prototype (that 3389 // we can't get through declaration merging). 3390 if (!NewFD->getType()->getAs<FunctionProtoType>()) { 3391 Diag(NewFD->getLocation(), 3392 diag::err_attribute_overloadable_no_prototype) 3393 << NewFD; 3394 Redeclaration = true; 3395 3396 // Turn this into a variadic function with no parameters. 3397 QualType R = Context.getFunctionType( 3398 NewFD->getType()->getAs<FunctionType>()->getResultType(), 3399 0, 0, true, 0, false, false, 0, 0, 3400 FunctionType::ExtInfo()); 3401 NewFD->setType(R); 3402 return NewFD->setInvalidDecl(); 3403 } 3404 } 3405 3406 switch (CheckOverload(NewFD, Previous, OldDecl)) { 3407 case Ovl_Match: 3408 Redeclaration = true; 3409 if (isa<UsingShadowDecl>(OldDecl) && CurContext->isRecord()) { 3410 HideUsingShadowDecl(S, cast<UsingShadowDecl>(OldDecl)); 3411 Redeclaration = false; 3412 } 3413 break; 3414 3415 case Ovl_NonFunction: 3416 Redeclaration = true; 3417 break; 3418 3419 case Ovl_Overload: 3420 Redeclaration = false; 3421 break; 3422 } 3423 } 3424 3425 if (Redeclaration) { 3426 // NewFD and OldDecl represent declarations that need to be 3427 // merged. 3428 if (MergeFunctionDecl(NewFD, OldDecl)) 3429 return NewFD->setInvalidDecl(); 3430 3431 Previous.clear(); 3432 Previous.addDecl(OldDecl); 3433 3434 if (FunctionTemplateDecl *OldTemplateDecl 3435 = dyn_cast<FunctionTemplateDecl>(OldDecl)) { 3436 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl()); 3437 FunctionTemplateDecl *NewTemplateDecl 3438 = NewFD->getDescribedFunctionTemplate(); 3439 assert(NewTemplateDecl && "Template/non-template mismatch"); 3440 if (CXXMethodDecl *Method 3441 = dyn_cast<CXXMethodDecl>(NewTemplateDecl->getTemplatedDecl())) { 3442 Method->setAccess(OldTemplateDecl->getAccess()); 3443 NewTemplateDecl->setAccess(OldTemplateDecl->getAccess()); 3444 } 3445 3446 // If this is an explicit specialization of a member that is a function 3447 // template, mark it as a member specialization. 3448 if (IsExplicitSpecialization && 3449 NewTemplateDecl->getInstantiatedFromMemberTemplate()) { 3450 NewTemplateDecl->setMemberSpecialization(); 3451 assert(OldTemplateDecl->isMemberSpecialization()); 3452 } 3453 } else { 3454 if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions 3455 NewFD->setAccess(OldDecl->getAccess()); 3456 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 3457 } 3458 } 3459 } 3460 3461 // Semantic checking for this function declaration (in isolation). 3462 if (getLangOptions().CPlusPlus) { 3463 // C++-specific checks. 3464 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) { 3465 CheckConstructor(Constructor); 3466 } else if (CXXDestructorDecl *Destructor = 3467 dyn_cast<CXXDestructorDecl>(NewFD)) { 3468 CXXRecordDecl *Record = Destructor->getParent(); 3469 QualType ClassType = Context.getTypeDeclType(Record); 3470 3471 // FIXME: Shouldn't we be able to perform thisc heck even when the class 3472 // type is dependent? Both gcc and edg can handle that. 3473 if (!ClassType->isDependentType()) { 3474 DeclarationName Name 3475 = Context.DeclarationNames.getCXXDestructorName( 3476 Context.getCanonicalType(ClassType)); 3477 if (NewFD->getDeclName() != Name) { 3478 Diag(NewFD->getLocation(), diag::err_destructor_name); 3479 return NewFD->setInvalidDecl(); 3480 } 3481 } 3482 3483 Record->setUserDeclaredDestructor(true); 3484 // C++ [class]p4: A POD-struct is an aggregate class that has [...] no 3485 // user-defined destructor. 3486 Record->setPOD(false); 3487 3488 // C++ [class.dtor]p3: A destructor is trivial if it is an implicitly- 3489 // declared destructor. 3490 // FIXME: C++0x: don't do this for "= default" destructors 3491 Record->setHasTrivialDestructor(false); 3492 } else if (CXXConversionDecl *Conversion 3493 = dyn_cast<CXXConversionDecl>(NewFD)) { 3494 ActOnConversionDeclarator(Conversion); 3495 } 3496 3497 // Find any virtual functions that this function overrides. 3498 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD)) { 3499 if (!Method->isFunctionTemplateSpecialization() && 3500 !Method->getDescribedFunctionTemplate()) 3501 AddOverriddenMethods(Method->getParent(), Method); 3502 } 3503 3504 // Additional checks for the destructor; make sure we do this after we 3505 // figure out whether the destructor is virtual. 3506 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(NewFD)) 3507 if (!Destructor->getParent()->isDependentType()) 3508 CheckDestructor(Destructor); 3509 3510 // Extra checking for C++ overloaded operators (C++ [over.oper]). 3511 if (NewFD->isOverloadedOperator() && 3512 CheckOverloadedOperatorDeclaration(NewFD)) 3513 return NewFD->setInvalidDecl(); 3514 3515 // Extra checking for C++0x literal operators (C++0x [over.literal]). 3516 if (NewFD->getLiteralIdentifier() && 3517 CheckLiteralOperatorDeclaration(NewFD)) 3518 return NewFD->setInvalidDecl(); 3519 3520 // In C++, check default arguments now that we have merged decls. Unless 3521 // the lexical context is the class, because in this case this is done 3522 // during delayed parsing anyway. 3523 if (!CurContext->isRecord()) 3524 CheckCXXDefaultArguments(NewFD); 3525 } 3526} 3527 3528void Sema::CheckMain(FunctionDecl* FD) { 3529 // C++ [basic.start.main]p3: A program that declares main to be inline 3530 // or static is ill-formed. 3531 // C99 6.7.4p4: In a hosted environment, the inline function specifier 3532 // shall not appear in a declaration of main. 3533 // static main is not an error under C99, but we should warn about it. 3534 bool isInline = FD->isInlineSpecified(); 3535 bool isStatic = FD->getStorageClass() == FunctionDecl::Static; 3536 if (isInline || isStatic) { 3537 unsigned diagID = diag::warn_unusual_main_decl; 3538 if (isInline || getLangOptions().CPlusPlus) 3539 diagID = diag::err_unusual_main_decl; 3540 3541 int which = isStatic + (isInline << 1) - 1; 3542 Diag(FD->getLocation(), diagID) << which; 3543 } 3544 3545 QualType T = FD->getType(); 3546 assert(T->isFunctionType() && "function decl is not of function type"); 3547 const FunctionType* FT = T->getAs<FunctionType>(); 3548 3549 if (!Context.hasSameUnqualifiedType(FT->getResultType(), Context.IntTy)) { 3550 // TODO: add a replacement fixit to turn the return type into 'int'. 3551 Diag(FD->getTypeSpecStartLoc(), diag::err_main_returns_nonint); 3552 FD->setInvalidDecl(true); 3553 } 3554 3555 // Treat protoless main() as nullary. 3556 if (isa<FunctionNoProtoType>(FT)) return; 3557 3558 const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT); 3559 unsigned nparams = FTP->getNumArgs(); 3560 assert(FD->getNumParams() == nparams); 3561 3562 bool HasExtraParameters = (nparams > 3); 3563 3564 // Darwin passes an undocumented fourth argument of type char**. If 3565 // other platforms start sprouting these, the logic below will start 3566 // getting shifty. 3567 if (nparams == 4 && 3568 Context.Target.getTriple().getOS() == llvm::Triple::Darwin) 3569 HasExtraParameters = false; 3570 3571 if (HasExtraParameters) { 3572 Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams; 3573 FD->setInvalidDecl(true); 3574 nparams = 3; 3575 } 3576 3577 // FIXME: a lot of the following diagnostics would be improved 3578 // if we had some location information about types. 3579 3580 QualType CharPP = 3581 Context.getPointerType(Context.getPointerType(Context.CharTy)); 3582 QualType Expected[] = { Context.IntTy, CharPP, CharPP, CharPP }; 3583 3584 for (unsigned i = 0; i < nparams; ++i) { 3585 QualType AT = FTP->getArgType(i); 3586 3587 bool mismatch = true; 3588 3589 if (Context.hasSameUnqualifiedType(AT, Expected[i])) 3590 mismatch = false; 3591 else if (Expected[i] == CharPP) { 3592 // As an extension, the following forms are okay: 3593 // char const ** 3594 // char const * const * 3595 // char * const * 3596 3597 QualifierCollector qs; 3598 const PointerType* PT; 3599 if ((PT = qs.strip(AT)->getAs<PointerType>()) && 3600 (PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) && 3601 (QualType(qs.strip(PT->getPointeeType()), 0) == Context.CharTy)) { 3602 qs.removeConst(); 3603 mismatch = !qs.empty(); 3604 } 3605 } 3606 3607 if (mismatch) { 3608 Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i]; 3609 // TODO: suggest replacing given type with expected type 3610 FD->setInvalidDecl(true); 3611 } 3612 } 3613 3614 if (nparams == 1 && !FD->isInvalidDecl()) { 3615 Diag(FD->getLocation(), diag::warn_main_one_arg); 3616 } 3617} 3618 3619bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 3620 // FIXME: Need strict checking. In C89, we need to check for 3621 // any assignment, increment, decrement, function-calls, or 3622 // commas outside of a sizeof. In C99, it's the same list, 3623 // except that the aforementioned are allowed in unevaluated 3624 // expressions. Everything else falls under the 3625 // "may accept other forms of constant expressions" exception. 3626 // (We never end up here for C++, so the constant expression 3627 // rules there don't matter.) 3628 if (Init->isConstantInitializer(Context)) 3629 return false; 3630 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 3631 << Init->getSourceRange(); 3632 return true; 3633} 3634 3635void Sema::AddInitializerToDecl(DeclPtrTy dcl, ExprArg init) { 3636 AddInitializerToDecl(dcl, move(init), /*DirectInit=*/false); 3637} 3638 3639/// AddInitializerToDecl - Adds the initializer Init to the 3640/// declaration dcl. If DirectInit is true, this is C++ direct 3641/// initialization rather than copy initialization. 3642void Sema::AddInitializerToDecl(DeclPtrTy dcl, ExprArg init, bool DirectInit) { 3643 Decl *RealDecl = dcl.getAs<Decl>(); 3644 // If there is no declaration, there was an error parsing it. Just ignore 3645 // the initializer. 3646 if (RealDecl == 0) 3647 return; 3648 3649 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 3650 // With declarators parsed the way they are, the parser cannot 3651 // distinguish between a normal initializer and a pure-specifier. 3652 // Thus this grotesque test. 3653 IntegerLiteral *IL; 3654 Expr *Init = static_cast<Expr *>(init.get()); 3655 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 3656 Context.getCanonicalType(IL->getType()) == Context.IntTy) 3657 CheckPureMethod(Method, Init->getSourceRange()); 3658 else { 3659 Diag(Method->getLocation(), diag::err_member_function_initialization) 3660 << Method->getDeclName() << Init->getSourceRange(); 3661 Method->setInvalidDecl(); 3662 } 3663 return; 3664 } 3665 3666 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 3667 if (!VDecl) { 3668 if (getLangOptions().CPlusPlus && 3669 RealDecl->getLexicalDeclContext()->isRecord() && 3670 isa<NamedDecl>(RealDecl)) 3671 Diag(RealDecl->getLocation(), diag::err_member_initialization) 3672 << cast<NamedDecl>(RealDecl)->getDeclName(); 3673 else 3674 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 3675 RealDecl->setInvalidDecl(); 3676 return; 3677 } 3678 3679 // A definition must end up with a complete type, which means it must be 3680 // complete with the restriction that an array type might be completed by the 3681 // initializer; note that later code assumes this restriction. 3682 QualType BaseDeclType = VDecl->getType(); 3683 if (const ArrayType *Array = Context.getAsIncompleteArrayType(BaseDeclType)) 3684 BaseDeclType = Array->getElementType(); 3685 if (RequireCompleteType(VDecl->getLocation(), BaseDeclType, 3686 diag::err_typecheck_decl_incomplete_type)) { 3687 RealDecl->setInvalidDecl(); 3688 return; 3689 } 3690 3691 // The variable can not have an abstract class type. 3692 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 3693 diag::err_abstract_type_in_decl, 3694 AbstractVariableType)) 3695 VDecl->setInvalidDecl(); 3696 3697 const VarDecl *Def; 3698 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 3699 Diag(VDecl->getLocation(), diag::err_redefinition) 3700 << VDecl->getDeclName(); 3701 Diag(Def->getLocation(), diag::note_previous_definition); 3702 VDecl->setInvalidDecl(); 3703 return; 3704 } 3705 3706 // Take ownership of the expression, now that we're sure we have somewhere 3707 // to put it. 3708 Expr *Init = init.takeAs<Expr>(); 3709 assert(Init && "missing initializer"); 3710 3711 // Capture the variable that is being initialized and the style of 3712 // initialization. 3713 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 3714 3715 // FIXME: Poor source location information. 3716 InitializationKind Kind 3717 = DirectInit? InitializationKind::CreateDirect(VDecl->getLocation(), 3718 Init->getLocStart(), 3719 Init->getLocEnd()) 3720 : InitializationKind::CreateCopy(VDecl->getLocation(), 3721 Init->getLocStart()); 3722 3723 // Get the decls type and save a reference for later, since 3724 // CheckInitializerTypes may change it. 3725 QualType DclT = VDecl->getType(), SavT = DclT; 3726 if (VDecl->isBlockVarDecl()) { 3727 if (VDecl->hasExternalStorage()) { // C99 6.7.8p5 3728 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 3729 VDecl->setInvalidDecl(); 3730 } else if (!VDecl->isInvalidDecl()) { 3731 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 3732 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 3733 MultiExprArg(*this, (void**)&Init, 1), 3734 &DclT); 3735 if (Result.isInvalid()) { 3736 VDecl->setInvalidDecl(); 3737 return; 3738 } 3739 3740 Init = Result.takeAs<Expr>(); 3741 3742 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 3743 // Don't check invalid declarations to avoid emitting useless diagnostics. 3744 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 3745 if (VDecl->getStorageClass() == VarDecl::Static) // C99 6.7.8p4. 3746 CheckForConstantInitializer(Init, DclT); 3747 } 3748 } 3749 } else if (VDecl->isStaticDataMember() && 3750 VDecl->getLexicalDeclContext()->isRecord()) { 3751 // This is an in-class initialization for a static data member, e.g., 3752 // 3753 // struct S { 3754 // static const int value = 17; 3755 // }; 3756 3757 // Attach the initializer 3758 VDecl->setInit(Init); 3759 3760 // C++ [class.mem]p4: 3761 // A member-declarator can contain a constant-initializer only 3762 // if it declares a static member (9.4) of const integral or 3763 // const enumeration type, see 9.4.2. 3764 QualType T = VDecl->getType(); 3765 if (!T->isDependentType() && 3766 (!Context.getCanonicalType(T).isConstQualified() || 3767 !T->isIntegralType())) { 3768 Diag(VDecl->getLocation(), diag::err_member_initialization) 3769 << VDecl->getDeclName() << Init->getSourceRange(); 3770 VDecl->setInvalidDecl(); 3771 } else { 3772 // C++ [class.static.data]p4: 3773 // If a static data member is of const integral or const 3774 // enumeration type, its declaration in the class definition 3775 // can specify a constant-initializer which shall be an 3776 // integral constant expression (5.19). 3777 if (!Init->isTypeDependent() && 3778 !Init->getType()->isIntegralType()) { 3779 // We have a non-dependent, non-integral or enumeration type. 3780 Diag(Init->getSourceRange().getBegin(), 3781 diag::err_in_class_initializer_non_integral_type) 3782 << Init->getType() << Init->getSourceRange(); 3783 VDecl->setInvalidDecl(); 3784 } else if (!Init->isTypeDependent() && !Init->isValueDependent()) { 3785 // Check whether the expression is a constant expression. 3786 llvm::APSInt Value; 3787 SourceLocation Loc; 3788 if (!Init->isIntegerConstantExpr(Value, Context, &Loc)) { 3789 Diag(Loc, diag::err_in_class_initializer_non_constant) 3790 << Init->getSourceRange(); 3791 VDecl->setInvalidDecl(); 3792 } else if (!VDecl->getType()->isDependentType()) 3793 ImpCastExprToType(Init, VDecl->getType(), CastExpr::CK_IntegralCast); 3794 } 3795 } 3796 } else if (VDecl->isFileVarDecl()) { 3797 if (VDecl->getStorageClass() == VarDecl::Extern) 3798 Diag(VDecl->getLocation(), diag::warn_extern_init); 3799 if (!VDecl->isInvalidDecl()) { 3800 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 3801 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 3802 MultiExprArg(*this, (void**)&Init, 1), 3803 &DclT); 3804 if (Result.isInvalid()) { 3805 VDecl->setInvalidDecl(); 3806 return; 3807 } 3808 3809 Init = Result.takeAs<Expr>(); 3810 } 3811 3812 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 3813 // Don't check invalid declarations to avoid emitting useless diagnostics. 3814 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 3815 // C99 6.7.8p4. All file scoped initializers need to be constant. 3816 CheckForConstantInitializer(Init, DclT); 3817 } 3818 } 3819 // If the type changed, it means we had an incomplete type that was 3820 // completed by the initializer. For example: 3821 // int ary[] = { 1, 3, 5 }; 3822 // "ary" transitions from a VariableArrayType to a ConstantArrayType. 3823 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 3824 VDecl->setType(DclT); 3825 Init->setType(DclT); 3826 } 3827 3828 Init = MaybeCreateCXXExprWithTemporaries(Init); 3829 // Attach the initializer to the decl. 3830 VDecl->setInit(Init); 3831 3832 if (getLangOptions().CPlusPlus) { 3833 // Make sure we mark the destructor as used if necessary. 3834 QualType InitType = VDecl->getType(); 3835 while (const ArrayType *Array = Context.getAsArrayType(InitType)) 3836 InitType = Context.getBaseElementType(Array); 3837 if (const RecordType *Record = InitType->getAs<RecordType>()) 3838 FinalizeVarWithDestructor(VDecl, Record); 3839 } 3840 3841 return; 3842} 3843 3844/// ActOnInitializerError - Given that there was an error parsing an 3845/// initializer for the given declaration, try to return to some form 3846/// of sanity. 3847void Sema::ActOnInitializerError(DeclPtrTy dcl) { 3848 // Our main concern here is re-establishing invariants like "a 3849 // variable's type is either dependent or complete". 3850 Decl *D = dcl.getAs<Decl>(); 3851 if (!D || D->isInvalidDecl()) return; 3852 3853 VarDecl *VD = dyn_cast<VarDecl>(D); 3854 if (!VD) return; 3855 3856 QualType Ty = VD->getType(); 3857 if (Ty->isDependentType()) return; 3858 3859 // Require a complete type. 3860 if (RequireCompleteType(VD->getLocation(), 3861 Context.getBaseElementType(Ty), 3862 diag::err_typecheck_decl_incomplete_type)) { 3863 VD->setInvalidDecl(); 3864 return; 3865 } 3866 3867 // Require an abstract type. 3868 if (RequireNonAbstractType(VD->getLocation(), Ty, 3869 diag::err_abstract_type_in_decl, 3870 AbstractVariableType)) { 3871 VD->setInvalidDecl(); 3872 return; 3873 } 3874 3875 // Don't bother complaining about constructors or destructors, 3876 // though. 3877} 3878 3879void Sema::ActOnUninitializedDecl(DeclPtrTy dcl, 3880 bool TypeContainsUndeducedAuto) { 3881 Decl *RealDecl = dcl.getAs<Decl>(); 3882 3883 // If there is no declaration, there was an error parsing it. Just ignore it. 3884 if (RealDecl == 0) 3885 return; 3886 3887 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 3888 QualType Type = Var->getType(); 3889 3890 // C++0x [dcl.spec.auto]p3 3891 if (TypeContainsUndeducedAuto) { 3892 Diag(Var->getLocation(), diag::err_auto_var_requires_init) 3893 << Var->getDeclName() << Type; 3894 Var->setInvalidDecl(); 3895 return; 3896 } 3897 3898 switch (Var->isThisDeclarationADefinition()) { 3899 case VarDecl::Definition: 3900 if (!Var->isStaticDataMember() || !Var->getAnyInitializer()) 3901 break; 3902 3903 // We have an out-of-line definition of a static data member 3904 // that has an in-class initializer, so we type-check this like 3905 // a declaration. 3906 // 3907 // Fall through 3908 3909 case VarDecl::DeclarationOnly: 3910 // It's only a declaration. 3911 3912 // Block scope. C99 6.7p7: If an identifier for an object is 3913 // declared with no linkage (C99 6.2.2p6), the type for the 3914 // object shall be complete. 3915 if (!Type->isDependentType() && Var->isBlockVarDecl() && 3916 !Var->getLinkage() && !Var->isInvalidDecl() && 3917 RequireCompleteType(Var->getLocation(), Type, 3918 diag::err_typecheck_decl_incomplete_type)) 3919 Var->setInvalidDecl(); 3920 3921 // Make sure that the type is not abstract. 3922 if (!Type->isDependentType() && !Var->isInvalidDecl() && 3923 RequireNonAbstractType(Var->getLocation(), Type, 3924 diag::err_abstract_type_in_decl, 3925 AbstractVariableType)) 3926 Var->setInvalidDecl(); 3927 return; 3928 3929 case VarDecl::TentativeDefinition: 3930 // File scope. C99 6.9.2p2: A declaration of an identifier for an 3931 // object that has file scope without an initializer, and without a 3932 // storage-class specifier or with the storage-class specifier "static", 3933 // constitutes a tentative definition. Note: A tentative definition with 3934 // external linkage is valid (C99 6.2.2p5). 3935 if (!Var->isInvalidDecl()) { 3936 if (const IncompleteArrayType *ArrayT 3937 = Context.getAsIncompleteArrayType(Type)) { 3938 if (RequireCompleteType(Var->getLocation(), 3939 ArrayT->getElementType(), 3940 diag::err_illegal_decl_array_incomplete_type)) 3941 Var->setInvalidDecl(); 3942 } else if (Var->getStorageClass() == VarDecl::Static) { 3943 // C99 6.9.2p3: If the declaration of an identifier for an object is 3944 // a tentative definition and has internal linkage (C99 6.2.2p3), the 3945 // declared type shall not be an incomplete type. 3946 // NOTE: code such as the following 3947 // static struct s; 3948 // struct s { int a; }; 3949 // is accepted by gcc. Hence here we issue a warning instead of 3950 // an error and we do not invalidate the static declaration. 3951 // NOTE: to avoid multiple warnings, only check the first declaration. 3952 if (Var->getPreviousDeclaration() == 0) 3953 RequireCompleteType(Var->getLocation(), Type, 3954 diag::ext_typecheck_decl_incomplete_type); 3955 } 3956 } 3957 3958 // Record the tentative definition; we're done. 3959 if (!Var->isInvalidDecl()) 3960 TentativeDefinitions.push_back(Var); 3961 return; 3962 } 3963 3964 // Provide a specific diagnostic for uninitialized variable 3965 // definitions with incomplete array type. 3966 if (Type->isIncompleteArrayType()) { 3967 Diag(Var->getLocation(), 3968 diag::err_typecheck_incomplete_array_needs_initializer); 3969 Var->setInvalidDecl(); 3970 return; 3971 } 3972 3973 // Provide a specific diagnostic for uninitialized variable 3974 // definitions with reference type. 3975 if (Type->isReferenceType()) { 3976 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 3977 << Var->getDeclName() 3978 << SourceRange(Var->getLocation(), Var->getLocation()); 3979 Var->setInvalidDecl(); 3980 return; 3981 } 3982 3983 // Do not attempt to type-check the default initializer for a 3984 // variable with dependent type. 3985 if (Type->isDependentType()) 3986 return; 3987 3988 if (Var->isInvalidDecl()) 3989 return; 3990 3991 if (RequireCompleteType(Var->getLocation(), 3992 Context.getBaseElementType(Type), 3993 diag::err_typecheck_decl_incomplete_type)) { 3994 Var->setInvalidDecl(); 3995 return; 3996 } 3997 3998 // The variable can not have an abstract class type. 3999 if (RequireNonAbstractType(Var->getLocation(), Type, 4000 diag::err_abstract_type_in_decl, 4001 AbstractVariableType)) { 4002 Var->setInvalidDecl(); 4003 return; 4004 } 4005 4006 const RecordType *Record 4007 = Context.getBaseElementType(Type)->getAs<RecordType>(); 4008 if (Record && getLangOptions().CPlusPlus && !getLangOptions().CPlusPlus0x && 4009 cast<CXXRecordDecl>(Record->getDecl())->isPOD()) { 4010 // C++03 [dcl.init]p9: 4011 // If no initializer is specified for an object, and the 4012 // object is of (possibly cv-qualified) non-POD class type (or 4013 // array thereof), the object shall be default-initialized; if 4014 // the object is of const-qualified type, the underlying class 4015 // type shall have a user-declared default 4016 // constructor. Otherwise, if no initializer is specified for 4017 // a non- static object, the object and its subobjects, if 4018 // any, have an indeterminate initial value); if the object 4019 // or any of its subobjects are of const-qualified type, the 4020 // program is ill-formed. 4021 // FIXME: DPG thinks it is very fishy that C++0x disables this. 4022 } else { 4023 InitializedEntity Entity = InitializedEntity::InitializeVariable(Var); 4024 InitializationKind Kind 4025 = InitializationKind::CreateDefault(Var->getLocation()); 4026 4027 InitializationSequence InitSeq(*this, Entity, Kind, 0, 0); 4028 OwningExprResult Init = InitSeq.Perform(*this, Entity, Kind, 4029 MultiExprArg(*this, 0, 0)); 4030 if (Init.isInvalid()) 4031 Var->setInvalidDecl(); 4032 else if (Init.get()) 4033 Var->setInit(MaybeCreateCXXExprWithTemporaries(Init.takeAs<Expr>())); 4034 } 4035 4036 if (!Var->isInvalidDecl() && getLangOptions().CPlusPlus && Record) 4037 FinalizeVarWithDestructor(Var, Record); 4038 } 4039} 4040 4041Sema::DeclGroupPtrTy Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS, 4042 DeclPtrTy *Group, 4043 unsigned NumDecls) { 4044 llvm::SmallVector<Decl*, 8> Decls; 4045 4046 if (DS.isTypeSpecOwned()) 4047 Decls.push_back((Decl*)DS.getTypeRep()); 4048 4049 for (unsigned i = 0; i != NumDecls; ++i) 4050 if (Decl *D = Group[i].getAs<Decl>()) 4051 Decls.push_back(D); 4052 4053 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, 4054 Decls.data(), Decls.size())); 4055} 4056 4057 4058/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 4059/// to introduce parameters into function prototype scope. 4060Sema::DeclPtrTy 4061Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 4062 const DeclSpec &DS = D.getDeclSpec(); 4063 4064 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 4065 VarDecl::StorageClass StorageClass = VarDecl::None; 4066 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 4067 StorageClass = VarDecl::Register; 4068 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 4069 Diag(DS.getStorageClassSpecLoc(), 4070 diag::err_invalid_storage_class_in_func_decl); 4071 D.getMutableDeclSpec().ClearStorageClassSpecs(); 4072 } 4073 4074 if (D.getDeclSpec().isThreadSpecified()) 4075 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 4076 4077 DiagnoseFunctionSpecifiers(D); 4078 4079 // Check that there are no default arguments inside the type of this 4080 // parameter (C++ only). 4081 if (getLangOptions().CPlusPlus) 4082 CheckExtraCXXDefaultArguments(D); 4083 4084 TypeSourceInfo *TInfo = 0; 4085 TagDecl *OwnedDecl = 0; 4086 QualType parmDeclType = GetTypeForDeclarator(D, S, &TInfo, &OwnedDecl); 4087 4088 if (getLangOptions().CPlusPlus && OwnedDecl && OwnedDecl->isDefinition()) { 4089 // C++ [dcl.fct]p6: 4090 // Types shall not be defined in return or parameter types. 4091 Diag(OwnedDecl->getLocation(), diag::err_type_defined_in_param_type) 4092 << Context.getTypeDeclType(OwnedDecl); 4093 } 4094 4095 // Check for redeclaration of parameters, e.g. int foo(int x, int x); 4096 IdentifierInfo *II = D.getIdentifier(); 4097 if (II) { 4098 LookupResult R(*this, II, D.getIdentifierLoc(), LookupOrdinaryName, 4099 ForRedeclaration); 4100 LookupName(R, S); 4101 if (R.isSingleResult()) { 4102 NamedDecl *PrevDecl = R.getFoundDecl(); 4103 if (PrevDecl->isTemplateParameter()) { 4104 // Maybe we will complain about the shadowed template parameter. 4105 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 4106 // Just pretend that we didn't see the previous declaration. 4107 PrevDecl = 0; 4108 } else if (S->isDeclScope(DeclPtrTy::make(PrevDecl))) { 4109 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 4110 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 4111 4112 // Recover by removing the name 4113 II = 0; 4114 D.SetIdentifier(0, D.getIdentifierLoc()); 4115 D.setInvalidType(true); 4116 } 4117 } 4118 } 4119 4120 // Parameters can not be abstract class types. 4121 // For record types, this is done by the AbstractClassUsageDiagnoser once 4122 // the class has been completely parsed. 4123 if (!CurContext->isRecord() && 4124 RequireNonAbstractType(D.getIdentifierLoc(), parmDeclType, 4125 diag::err_abstract_type_in_decl, 4126 AbstractParamType)) 4127 D.setInvalidType(true); 4128 4129 QualType T = adjustParameterType(parmDeclType); 4130 4131 // Temporarily put parameter variables in the translation unit, not 4132 // the enclosing context. This prevents them from accidentally 4133 // looking like class members in C++. 4134 DeclContext *DC = Context.getTranslationUnitDecl(); 4135 4136 ParmVarDecl *New 4137 = ParmVarDecl::Create(Context, DC, D.getIdentifierLoc(), II, 4138 T, TInfo, StorageClass, 0); 4139 4140 if (D.isInvalidType()) 4141 New->setInvalidDecl(); 4142 4143 // Parameter declarators cannot be interface types. All ObjC objects are 4144 // passed by reference. 4145 if (T->isObjCInterfaceType()) { 4146 Diag(D.getIdentifierLoc(), 4147 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T; 4148 New->setInvalidDecl(); 4149 } 4150 4151 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 4152 if (D.getCXXScopeSpec().isSet()) { 4153 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 4154 << D.getCXXScopeSpec().getRange(); 4155 New->setInvalidDecl(); 4156 } 4157 4158 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage 4159 // duration shall not be qualified by an address-space qualifier." 4160 // Since all parameters have automatic store duration, they can not have 4161 // an address space. 4162 if (T.getAddressSpace() != 0) { 4163 Diag(D.getIdentifierLoc(), 4164 diag::err_arg_with_address_space); 4165 New->setInvalidDecl(); 4166 } 4167 4168 4169 // Add the parameter declaration into this scope. 4170 S->AddDecl(DeclPtrTy::make(New)); 4171 if (II) 4172 IdResolver.AddDecl(New); 4173 4174 ProcessDeclAttributes(S, New, D); 4175 4176 if (New->hasAttr<BlocksAttr>()) { 4177 Diag(New->getLocation(), diag::err_block_on_nonlocal); 4178 } 4179 return DeclPtrTy::make(New); 4180} 4181 4182void Sema::ActOnObjCCatchParam(DeclPtrTy D) { 4183 ParmVarDecl *Param = cast<ParmVarDecl>(D.getAs<Decl>()); 4184 Param->setDeclContext(CurContext); 4185} 4186 4187void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, 4188 SourceLocation LocAfterDecls) { 4189 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 4190 "Not a function declarator!"); 4191 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 4192 4193 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 4194 // for a K&R function. 4195 if (!FTI.hasPrototype) { 4196 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) { 4197 --i; 4198 if (FTI.ArgInfo[i].Param == 0) { 4199 llvm::SmallString<256> Code; 4200 llvm::raw_svector_ostream(Code) << " int " 4201 << FTI.ArgInfo[i].Ident->getName() 4202 << ";\n"; 4203 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 4204 << FTI.ArgInfo[i].Ident 4205 << FixItHint::CreateInsertion(LocAfterDecls, Code.str()); 4206 4207 // Implicitly declare the argument as type 'int' for lack of a better 4208 // type. 4209 DeclSpec DS; 4210 const char* PrevSpec; // unused 4211 unsigned DiagID; // unused 4212 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 4213 PrevSpec, DiagID); 4214 Declarator ParamD(DS, Declarator::KNRTypeListContext); 4215 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 4216 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 4217 } 4218 } 4219 } 4220} 4221 4222Sema::DeclPtrTy Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, 4223 Declarator &D) { 4224 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 4225 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 4226 "Not a function declarator!"); 4227 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 4228 4229 if (FTI.hasPrototype) { 4230 // FIXME: Diagnose arguments without names in C. 4231 } 4232 4233 Scope *ParentScope = FnBodyScope->getParent(); 4234 4235 DeclPtrTy DP = HandleDeclarator(ParentScope, D, 4236 MultiTemplateParamsArg(*this), 4237 /*IsFunctionDefinition=*/true); 4238 return ActOnStartOfFunctionDef(FnBodyScope, DP); 4239} 4240 4241static bool ShouldWarnAboutMissingPrototype(const FunctionDecl *FD) { 4242 // Don't warn about invalid declarations. 4243 if (FD->isInvalidDecl()) 4244 return false; 4245 4246 // Or declarations that aren't global. 4247 if (!FD->isGlobal()) 4248 return false; 4249 4250 // Don't warn about C++ member functions. 4251 if (isa<CXXMethodDecl>(FD)) 4252 return false; 4253 4254 // Don't warn about 'main'. 4255 if (FD->isMain()) 4256 return false; 4257 4258 // Don't warn about inline functions. 4259 if (FD->isInlineSpecified()) 4260 return false; 4261 4262 // Don't warn about function templates. 4263 if (FD->getDescribedFunctionTemplate()) 4264 return false; 4265 4266 // Don't warn about function template specializations. 4267 if (FD->isFunctionTemplateSpecialization()) 4268 return false; 4269 4270 bool MissingPrototype = true; 4271 for (const FunctionDecl *Prev = FD->getPreviousDeclaration(); 4272 Prev; Prev = Prev->getPreviousDeclaration()) { 4273 // Ignore any declarations that occur in function or method 4274 // scope, because they aren't visible from the header. 4275 if (Prev->getDeclContext()->isFunctionOrMethod()) 4276 continue; 4277 4278 MissingPrototype = !Prev->getType()->isFunctionProtoType(); 4279 break; 4280 } 4281 4282 return MissingPrototype; 4283} 4284 4285Sema::DeclPtrTy Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, DeclPtrTy D) { 4286 // Clear the last template instantiation error context. 4287 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiation(); 4288 4289 if (!D) 4290 return D; 4291 FunctionDecl *FD = 0; 4292 4293 if (FunctionTemplateDecl *FunTmpl 4294 = dyn_cast<FunctionTemplateDecl>(D.getAs<Decl>())) 4295 FD = FunTmpl->getTemplatedDecl(); 4296 else 4297 FD = cast<FunctionDecl>(D.getAs<Decl>()); 4298 4299 // Enter a new function scope 4300 PushFunctionScope(); 4301 4302 // See if this is a redefinition. 4303 // But don't complain if we're in GNU89 mode and the previous definition 4304 // was an extern inline function. 4305 const FunctionDecl *Definition; 4306 if (FD->getBody(Definition) && 4307 !canRedefineFunction(Definition, getLangOptions())) { 4308 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 4309 Diag(Definition->getLocation(), diag::note_previous_definition); 4310 } 4311 4312 // Builtin functions cannot be defined. 4313 if (unsigned BuiltinID = FD->getBuiltinID()) { 4314 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 4315 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 4316 FD->setInvalidDecl(); 4317 } 4318 } 4319 4320 // The return type of a function definition must be complete 4321 // (C99 6.9.1p3, C++ [dcl.fct]p6). 4322 QualType ResultType = FD->getResultType(); 4323 if (!ResultType->isDependentType() && !ResultType->isVoidType() && 4324 !FD->isInvalidDecl() && 4325 RequireCompleteType(FD->getLocation(), ResultType, 4326 diag::err_func_def_incomplete_result)) 4327 FD->setInvalidDecl(); 4328 4329 // GNU warning -Wmissing-prototypes: 4330 // Warn if a global function is defined without a previous 4331 // prototype declaration. This warning is issued even if the 4332 // definition itself provides a prototype. The aim is to detect 4333 // global functions that fail to be declared in header files. 4334 if (ShouldWarnAboutMissingPrototype(FD)) 4335 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; 4336 4337 if (FnBodyScope) 4338 PushDeclContext(FnBodyScope, FD); 4339 4340 // Check the validity of our function parameters 4341 CheckParmsForFunctionDef(FD); 4342 4343 bool ShouldCheckShadow = 4344 Diags.getDiagnosticLevel(diag::warn_decl_shadow) != Diagnostic::Ignored; 4345 4346 // Introduce our parameters into the function scope 4347 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 4348 ParmVarDecl *Param = FD->getParamDecl(p); 4349 Param->setOwningFunction(FD); 4350 4351 // If this has an identifier, add it to the scope stack. 4352 if (Param->getIdentifier() && FnBodyScope) { 4353 if (ShouldCheckShadow) 4354 CheckShadow(FnBodyScope, Param); 4355 4356 PushOnScopeChains(Param, FnBodyScope); 4357 } 4358 } 4359 4360 // Checking attributes of current function definition 4361 // dllimport attribute. 4362 if (FD->getAttr<DLLImportAttr>() && 4363 (!FD->getAttr<DLLExportAttr>())) { 4364 // dllimport attribute cannot be applied to definition. 4365 if (!(FD->getAttr<DLLImportAttr>())->isInherited()) { 4366 Diag(FD->getLocation(), 4367 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 4368 << "dllimport"; 4369 FD->setInvalidDecl(); 4370 return DeclPtrTy::make(FD); 4371 } 4372 4373 // Visual C++ appears to not think this is an issue, so only issue 4374 // a warning when Microsoft extensions are disabled. 4375 if (!LangOpts.Microsoft) { 4376 // If a symbol previously declared dllimport is later defined, the 4377 // attribute is ignored in subsequent references, and a warning is 4378 // emitted. 4379 Diag(FD->getLocation(), 4380 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 4381 << FD->getNameAsCString() << "dllimport"; 4382 } 4383 } 4384 return DeclPtrTy::make(FD); 4385} 4386 4387Sema::DeclPtrTy Sema::ActOnFinishFunctionBody(DeclPtrTy D, StmtArg BodyArg) { 4388 return ActOnFinishFunctionBody(D, move(BodyArg), false); 4389} 4390 4391Sema::DeclPtrTy Sema::ActOnFinishFunctionBody(DeclPtrTy D, StmtArg BodyArg, 4392 bool IsInstantiation) { 4393 Decl *dcl = D.getAs<Decl>(); 4394 Stmt *Body = BodyArg.takeAs<Stmt>(); 4395 4396 FunctionDecl *FD = 0; 4397 FunctionTemplateDecl *FunTmpl = dyn_cast_or_null<FunctionTemplateDecl>(dcl); 4398 if (FunTmpl) 4399 FD = FunTmpl->getTemplatedDecl(); 4400 else 4401 FD = dyn_cast_or_null<FunctionDecl>(dcl); 4402 4403 sema::AnalysisBasedWarnings::Policy WP = AnalysisWarnings.getDefaultPolicy(); 4404 4405 if (FD) { 4406 FD->setBody(Body); 4407 if (FD->isMain()) { 4408 // C and C++ allow for main to automagically return 0. 4409 // Implements C++ [basic.start.main]p5 and C99 5.1.2.2.3. 4410 FD->setHasImplicitReturnZero(true); 4411 WP.disableCheckFallThrough(); 4412 } 4413 4414 if (!FD->isInvalidDecl()) 4415 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end()); 4416 4417 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FD)) 4418 MaybeMarkVirtualMembersReferenced(Method->getLocation(), Method); 4419 4420 assert(FD == getCurFunctionDecl() && "Function parsing confused"); 4421 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 4422 assert(MD == getCurMethodDecl() && "Method parsing confused"); 4423 MD->setBody(Body); 4424 MD->setEndLoc(Body->getLocEnd()); 4425 if (!MD->isInvalidDecl()) 4426 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end()); 4427 } else { 4428 Body->Destroy(Context); 4429 return DeclPtrTy(); 4430 } 4431 4432 // Verify and clean out per-function state. 4433 4434 // Check goto/label use. 4435 for (llvm::DenseMap<IdentifierInfo*, LabelStmt*>::iterator 4436 I = getLabelMap().begin(), E = getLabelMap().end(); I != E; ++I) { 4437 LabelStmt *L = I->second; 4438 4439 // Verify that we have no forward references left. If so, there was a goto 4440 // or address of a label taken, but no definition of it. Label fwd 4441 // definitions are indicated with a null substmt. 4442 if (L->getSubStmt() != 0) 4443 continue; 4444 4445 // Emit error. 4446 Diag(L->getIdentLoc(), diag::err_undeclared_label_use) << L->getName(); 4447 4448 // At this point, we have gotos that use the bogus label. Stitch it into 4449 // the function body so that they aren't leaked and that the AST is well 4450 // formed. 4451 if (Body == 0) { 4452 // The whole function wasn't parsed correctly, just delete this. 4453 L->Destroy(Context); 4454 continue; 4455 } 4456 4457 // Otherwise, the body is valid: we want to stitch the label decl into the 4458 // function somewhere so that it is properly owned and so that the goto 4459 // has a valid target. Do this by creating a new compound stmt with the 4460 // label in it. 4461 4462 // Give the label a sub-statement. 4463 L->setSubStmt(new (Context) NullStmt(L->getIdentLoc())); 4464 4465 CompoundStmt *Compound = isa<CXXTryStmt>(Body) ? 4466 cast<CXXTryStmt>(Body)->getTryBlock() : 4467 cast<CompoundStmt>(Body); 4468 llvm::SmallVector<Stmt*, 64> Elements(Compound->body_begin(), 4469 Compound->body_end()); 4470 Elements.push_back(L); 4471 Compound->setStmts(Context, Elements.data(), Elements.size()); 4472 } 4473 4474 if (Body) { 4475 // C++ constructors that have function-try-blocks can't have return 4476 // statements in the handlers of that block. (C++ [except.handle]p14) 4477 // Verify this. 4478 if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body)) 4479 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body)); 4480 4481 // Verify that that gotos and switch cases don't jump into scopes illegally. 4482 // Verify that that gotos and switch cases don't jump into scopes illegally. 4483 if (FunctionNeedsScopeChecking() && !hasAnyErrorsInThisFunction()) 4484 DiagnoseInvalidJumps(Body); 4485 4486 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) 4487 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 4488 Destructor->getParent()); 4489 4490 // If any errors have occurred, clear out any temporaries that may have 4491 // been leftover. This ensures that these temporaries won't be picked up for 4492 // deletion in some later function. 4493 if (PP.getDiagnostics().hasErrorOccurred()) 4494 ExprTemporaries.clear(); 4495 else if (!isa<FunctionTemplateDecl>(dcl)) { 4496 // Since the body is valid, issue any analysis-based warnings that are 4497 // enabled. 4498 QualType ResultType; 4499 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(dcl)) { 4500 ResultType = FD->getResultType(); 4501 } 4502 else { 4503 ObjCMethodDecl *MD = cast<ObjCMethodDecl>(dcl); 4504 ResultType = MD->getResultType(); 4505 } 4506 AnalysisWarnings.IssueWarnings(WP, dcl); 4507 } 4508 4509 assert(ExprTemporaries.empty() && "Leftover temporaries in function"); 4510 } 4511 4512 if (!IsInstantiation) 4513 PopDeclContext(); 4514 4515 PopFunctionOrBlockScope(); 4516 4517 // If any errors have occurred, clear out any temporaries that may have 4518 // been leftover. This ensures that these temporaries won't be picked up for 4519 // deletion in some later function. 4520 if (getDiagnostics().hasErrorOccurred()) 4521 ExprTemporaries.clear(); 4522 4523 return D; 4524} 4525 4526/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 4527/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 4528NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 4529 IdentifierInfo &II, Scope *S) { 4530 // Before we produce a declaration for an implicitly defined 4531 // function, see whether there was a locally-scoped declaration of 4532 // this name as a function or variable. If so, use that 4533 // (non-visible) declaration, and complain about it. 4534 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 4535 = LocallyScopedExternalDecls.find(&II); 4536 if (Pos != LocallyScopedExternalDecls.end()) { 4537 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 4538 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 4539 return Pos->second; 4540 } 4541 4542 // Extension in C99. Legal in C90, but warn about it. 4543 if (II.getName().startswith("__builtin_")) 4544 Diag(Loc, diag::warn_builtin_unknown) << &II; 4545 else if (getLangOptions().C99) 4546 Diag(Loc, diag::ext_implicit_function_decl) << &II; 4547 else 4548 Diag(Loc, diag::warn_implicit_function_decl) << &II; 4549 4550 // Set a Declarator for the implicit definition: int foo(); 4551 const char *Dummy; 4552 DeclSpec DS; 4553 unsigned DiagID; 4554 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID); 4555 Error = Error; // Silence warning. 4556 assert(!Error && "Error setting up implicit decl!"); 4557 Declarator D(DS, Declarator::BlockContext); 4558 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 0, 4559 0, 0, false, SourceLocation(), 4560 false, 0,0,0, Loc, Loc, D), 4561 SourceLocation()); 4562 D.SetIdentifier(&II, Loc); 4563 4564 // Insert this function into translation-unit scope. 4565 4566 DeclContext *PrevDC = CurContext; 4567 CurContext = Context.getTranslationUnitDecl(); 4568 4569 FunctionDecl *FD = 4570 dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D).getAs<Decl>()); 4571 FD->setImplicit(); 4572 4573 CurContext = PrevDC; 4574 4575 AddKnownFunctionAttributes(FD); 4576 4577 return FD; 4578} 4579 4580/// \brief Adds any function attributes that we know a priori based on 4581/// the declaration of this function. 4582/// 4583/// These attributes can apply both to implicitly-declared builtins 4584/// (like __builtin___printf_chk) or to library-declared functions 4585/// like NSLog or printf. 4586void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 4587 if (FD->isInvalidDecl()) 4588 return; 4589 4590 // If this is a built-in function, map its builtin attributes to 4591 // actual attributes. 4592 if (unsigned BuiltinID = FD->getBuiltinID()) { 4593 // Handle printf-formatting attributes. 4594 unsigned FormatIdx; 4595 bool HasVAListArg; 4596 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 4597 if (!FD->getAttr<FormatAttr>()) 4598 FD->addAttr(::new (Context) FormatAttr(Context, "printf", FormatIdx+1, 4599 HasVAListArg ? 0 : FormatIdx+2)); 4600 } 4601 4602 // Mark const if we don't care about errno and that is the only 4603 // thing preventing the function from being const. This allows 4604 // IRgen to use LLVM intrinsics for such functions. 4605 if (!getLangOptions().MathErrno && 4606 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 4607 if (!FD->getAttr<ConstAttr>()) 4608 FD->addAttr(::new (Context) ConstAttr()); 4609 } 4610 4611 if (Context.BuiltinInfo.isNoReturn(BuiltinID)) 4612 FD->setType(Context.getNoReturnType(FD->getType())); 4613 if (Context.BuiltinInfo.isNoThrow(BuiltinID)) 4614 FD->addAttr(::new (Context) NoThrowAttr()); 4615 if (Context.BuiltinInfo.isConst(BuiltinID)) 4616 FD->addAttr(::new (Context) ConstAttr()); 4617 } 4618 4619 IdentifierInfo *Name = FD->getIdentifier(); 4620 if (!Name) 4621 return; 4622 if ((!getLangOptions().CPlusPlus && 4623 FD->getDeclContext()->isTranslationUnit()) || 4624 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 4625 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 4626 LinkageSpecDecl::lang_c)) { 4627 // Okay: this could be a libc/libm/Objective-C function we know 4628 // about. 4629 } else 4630 return; 4631 4632 if (Name->isStr("NSLog") || Name->isStr("NSLogv")) { 4633 // FIXME: NSLog and NSLogv should be target specific 4634 if (const FormatAttr *Format = FD->getAttr<FormatAttr>()) { 4635 // FIXME: We known better than our headers. 4636 const_cast<FormatAttr *>(Format)->setType(Context, "printf"); 4637 } else 4638 FD->addAttr(::new (Context) FormatAttr(Context, "printf", 1, 4639 Name->isStr("NSLogv") ? 0 : 2)); 4640 } else if (Name->isStr("asprintf") || Name->isStr("vasprintf")) { 4641 // FIXME: asprintf and vasprintf aren't C99 functions. Should they be 4642 // target-specific builtins, perhaps? 4643 if (!FD->getAttr<FormatAttr>()) 4644 FD->addAttr(::new (Context) FormatAttr(Context, "printf", 2, 4645 Name->isStr("vasprintf") ? 0 : 3)); 4646 } 4647} 4648 4649TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 4650 TypeSourceInfo *TInfo) { 4651 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 4652 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 4653 4654 if (!TInfo) { 4655 assert(D.isInvalidType() && "no declarator info for valid type"); 4656 TInfo = Context.getTrivialTypeSourceInfo(T); 4657 } 4658 4659 // Scope manipulation handled by caller. 4660 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 4661 D.getIdentifierLoc(), 4662 D.getIdentifier(), 4663 TInfo); 4664 4665 if (const TagType *TT = T->getAs<TagType>()) { 4666 TagDecl *TD = TT->getDecl(); 4667 4668 // If the TagDecl that the TypedefDecl points to is an anonymous decl 4669 // keep track of the TypedefDecl. 4670 if (!TD->getIdentifier() && !TD->getTypedefForAnonDecl()) 4671 TD->setTypedefForAnonDecl(NewTD); 4672 } 4673 4674 if (D.isInvalidType()) 4675 NewTD->setInvalidDecl(); 4676 return NewTD; 4677} 4678 4679 4680/// \brief Determine whether a tag with a given kind is acceptable 4681/// as a redeclaration of the given tag declaration. 4682/// 4683/// \returns true if the new tag kind is acceptable, false otherwise. 4684bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous, 4685 TagDecl::TagKind NewTag, 4686 SourceLocation NewTagLoc, 4687 const IdentifierInfo &Name) { 4688 // C++ [dcl.type.elab]p3: 4689 // The class-key or enum keyword present in the 4690 // elaborated-type-specifier shall agree in kind with the 4691 // declaration to which the name in theelaborated-type-specifier 4692 // refers. This rule also applies to the form of 4693 // elaborated-type-specifier that declares a class-name or 4694 // friend class since it can be construed as referring to the 4695 // definition of the class. Thus, in any 4696 // elaborated-type-specifier, the enum keyword shall be used to 4697 // refer to an enumeration (7.2), the union class-keyshall be 4698 // used to refer to a union (clause 9), and either the class or 4699 // struct class-key shall be used to refer to a class (clause 9) 4700 // declared using the class or struct class-key. 4701 TagDecl::TagKind OldTag = Previous->getTagKind(); 4702 if (OldTag == NewTag) 4703 return true; 4704 4705 if ((OldTag == TagDecl::TK_struct || OldTag == TagDecl::TK_class) && 4706 (NewTag == TagDecl::TK_struct || NewTag == TagDecl::TK_class)) { 4707 // Warn about the struct/class tag mismatch. 4708 bool isTemplate = false; 4709 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous)) 4710 isTemplate = Record->getDescribedClassTemplate(); 4711 4712 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 4713 << (NewTag == TagDecl::TK_class) 4714 << isTemplate << &Name 4715 << FixItHint::CreateReplacement(SourceRange(NewTagLoc), 4716 OldTag == TagDecl::TK_class? "class" : "struct"); 4717 Diag(Previous->getLocation(), diag::note_previous_use); 4718 return true; 4719 } 4720 return false; 4721} 4722 4723/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 4724/// former case, Name will be non-null. In the later case, Name will be null. 4725/// TagSpec indicates what kind of tag this is. TUK indicates whether this is a 4726/// reference/declaration/definition of a tag. 4727Sema::DeclPtrTy Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK, 4728 SourceLocation KWLoc, CXXScopeSpec &SS, 4729 IdentifierInfo *Name, SourceLocation NameLoc, 4730 AttributeList *Attr, AccessSpecifier AS, 4731 MultiTemplateParamsArg TemplateParameterLists, 4732 bool &OwnedDecl, bool &IsDependent) { 4733 // If this is not a definition, it must have a name. 4734 assert((Name != 0 || TUK == TUK_Definition) && 4735 "Nameless record must be a definition!"); 4736 4737 OwnedDecl = false; 4738 TagDecl::TagKind Kind = TagDecl::getTagKindForTypeSpec(TagSpec); 4739 4740 // FIXME: Check explicit specializations more carefully. 4741 bool isExplicitSpecialization = false; 4742 if (TUK != TUK_Reference) { 4743 if (TemplateParameterList *TemplateParams 4744 = MatchTemplateParametersToScopeSpecifier(KWLoc, SS, 4745 (TemplateParameterList**)TemplateParameterLists.get(), 4746 TemplateParameterLists.size(), 4747 isExplicitSpecialization)) { 4748 if (TemplateParams->size() > 0) { 4749 // This is a declaration or definition of a class template (which may 4750 // be a member of another template). 4751 OwnedDecl = false; 4752 DeclResult Result = CheckClassTemplate(S, TagSpec, TUK, KWLoc, 4753 SS, Name, NameLoc, Attr, 4754 TemplateParams, 4755 AS); 4756 TemplateParameterLists.release(); 4757 return Result.get(); 4758 } else { 4759 // The "template<>" header is extraneous. 4760 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 4761 << ElaboratedType::getNameForTagKind(Kind) << Name; 4762 isExplicitSpecialization = true; 4763 } 4764 } 4765 4766 TemplateParameterLists.release(); 4767 } 4768 4769 DeclContext *SearchDC = CurContext; 4770 DeclContext *DC = CurContext; 4771 bool isStdBadAlloc = false; 4772 bool Invalid = false; 4773 4774 RedeclarationKind Redecl = ForRedeclaration; 4775 if (TUK == TUK_Friend || TUK == TUK_Reference) 4776 Redecl = NotForRedeclaration; 4777 4778 LookupResult Previous(*this, Name, NameLoc, LookupTagName, Redecl); 4779 4780 if (Name && SS.isNotEmpty()) { 4781 // We have a nested-name tag ('struct foo::bar'). 4782 4783 // Check for invalid 'foo::'. 4784 if (SS.isInvalid()) { 4785 Name = 0; 4786 goto CreateNewDecl; 4787 } 4788 4789 // If this is a friend or a reference to a class in a dependent 4790 // context, don't try to make a decl for it. 4791 if (TUK == TUK_Friend || TUK == TUK_Reference) { 4792 DC = computeDeclContext(SS, false); 4793 if (!DC) { 4794 IsDependent = true; 4795 return DeclPtrTy(); 4796 } 4797 } 4798 4799 if (RequireCompleteDeclContext(SS)) 4800 return DeclPtrTy::make((Decl *)0); 4801 4802 DC = computeDeclContext(SS, true); 4803 SearchDC = DC; 4804 // Look-up name inside 'foo::'. 4805 LookupQualifiedName(Previous, DC); 4806 4807 if (Previous.isAmbiguous()) 4808 return DeclPtrTy(); 4809 4810 if (Previous.empty()) { 4811 // Name lookup did not find anything. However, if the 4812 // nested-name-specifier refers to the current instantiation, 4813 // and that current instantiation has any dependent base 4814 // classes, we might find something at instantiation time: treat 4815 // this as a dependent elaborated-type-specifier. 4816 if (Previous.wasNotFoundInCurrentInstantiation()) { 4817 IsDependent = true; 4818 return DeclPtrTy(); 4819 } 4820 4821 // A tag 'foo::bar' must already exist. 4822 Diag(NameLoc, diag::err_not_tag_in_scope) 4823 << Kind << Name << DC << SS.getRange(); 4824 Name = 0; 4825 Invalid = true; 4826 goto CreateNewDecl; 4827 } 4828 } else if (Name) { 4829 // If this is a named struct, check to see if there was a previous forward 4830 // declaration or definition. 4831 // FIXME: We're looking into outer scopes here, even when we 4832 // shouldn't be. Doing so can result in ambiguities that we 4833 // shouldn't be diagnosing. 4834 LookupName(Previous, S); 4835 4836 // Note: there used to be some attempt at recovery here. 4837 if (Previous.isAmbiguous()) 4838 return DeclPtrTy(); 4839 4840 if (!getLangOptions().CPlusPlus && TUK != TUK_Reference) { 4841 // FIXME: This makes sure that we ignore the contexts associated 4842 // with C structs, unions, and enums when looking for a matching 4843 // tag declaration or definition. See the similar lookup tweak 4844 // in Sema::LookupName; is there a better way to deal with this? 4845 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 4846 SearchDC = SearchDC->getParent(); 4847 } 4848 } 4849 4850 if (Previous.isSingleResult() && 4851 Previous.getFoundDecl()->isTemplateParameter()) { 4852 // Maybe we will complain about the shadowed template parameter. 4853 DiagnoseTemplateParameterShadow(NameLoc, Previous.getFoundDecl()); 4854 // Just pretend that we didn't see the previous declaration. 4855 Previous.clear(); 4856 } 4857 4858 if (getLangOptions().CPlusPlus && Name && DC && StdNamespace && 4859 DC->Equals(StdNamespace) && Name->isStr("bad_alloc")) { 4860 // This is a declaration of or a reference to "std::bad_alloc". 4861 isStdBadAlloc = true; 4862 4863 if (Previous.empty() && StdBadAlloc) { 4864 // std::bad_alloc has been implicitly declared (but made invisible to 4865 // name lookup). Fill in this implicit declaration as the previous 4866 // declaration, so that the declarations get chained appropriately. 4867 Previous.addDecl(StdBadAlloc); 4868 } 4869 } 4870 4871 // If we didn't find a previous declaration, and this is a reference 4872 // (or friend reference), move to the correct scope. In C++, we 4873 // also need to do a redeclaration lookup there, just in case 4874 // there's a shadow friend decl. 4875 if (Name && Previous.empty() && 4876 (TUK == TUK_Reference || TUK == TUK_Friend)) { 4877 if (Invalid) goto CreateNewDecl; 4878 assert(SS.isEmpty()); 4879 4880 if (TUK == TUK_Reference) { 4881 // C++ [basic.scope.pdecl]p5: 4882 // -- for an elaborated-type-specifier of the form 4883 // 4884 // class-key identifier 4885 // 4886 // if the elaborated-type-specifier is used in the 4887 // decl-specifier-seq or parameter-declaration-clause of a 4888 // function defined in namespace scope, the identifier is 4889 // declared as a class-name in the namespace that contains 4890 // the declaration; otherwise, except as a friend 4891 // declaration, the identifier is declared in the smallest 4892 // non-class, non-function-prototype scope that contains the 4893 // declaration. 4894 // 4895 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 4896 // C structs and unions. 4897 // 4898 // It is an error in C++ to declare (rather than define) an enum 4899 // type, including via an elaborated type specifier. We'll 4900 // diagnose that later; for now, declare the enum in the same 4901 // scope as we would have picked for any other tag type. 4902 // 4903 // GNU C also supports this behavior as part of its incomplete 4904 // enum types extension, while GNU C++ does not. 4905 // 4906 // Find the context where we'll be declaring the tag. 4907 // FIXME: We would like to maintain the current DeclContext as the 4908 // lexical context, 4909 while (SearchDC->isRecord()) 4910 SearchDC = SearchDC->getParent(); 4911 4912 // Find the scope where we'll be declaring the tag. 4913 while (S->isClassScope() || 4914 (getLangOptions().CPlusPlus && 4915 S->isFunctionPrototypeScope()) || 4916 ((S->getFlags() & Scope::DeclScope) == 0) || 4917 (S->getEntity() && 4918 ((DeclContext *)S->getEntity())->isTransparentContext())) 4919 S = S->getParent(); 4920 } else { 4921 assert(TUK == TUK_Friend); 4922 // C++ [namespace.memdef]p3: 4923 // If a friend declaration in a non-local class first declares a 4924 // class or function, the friend class or function is a member of 4925 // the innermost enclosing namespace. 4926 SearchDC = SearchDC->getEnclosingNamespaceContext(); 4927 4928 // Look up through our scopes until we find one with an entity which 4929 // matches our declaration context. 4930 while (S->getEntity() && 4931 ((DeclContext *)S->getEntity())->getPrimaryContext() != SearchDC) { 4932 S = S->getParent(); 4933 assert(S && "No enclosing scope matching the enclosing namespace."); 4934 } 4935 } 4936 4937 // In C++, look for a shadow friend decl. 4938 if (getLangOptions().CPlusPlus) { 4939 Previous.setRedeclarationKind(ForRedeclaration); 4940 LookupQualifiedName(Previous, SearchDC); 4941 } 4942 } 4943 4944 if (!Previous.empty()) { 4945 assert(Previous.isSingleResult()); 4946 NamedDecl *PrevDecl = Previous.getFoundDecl(); 4947 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 4948 // If this is a use of a previous tag, or if the tag is already declared 4949 // in the same scope (so that the definition/declaration completes or 4950 // rementions the tag), reuse the decl. 4951 if (TUK == TUK_Reference || TUK == TUK_Friend || 4952 isDeclInScope(PrevDecl, SearchDC, S)) { 4953 // Make sure that this wasn't declared as an enum and now used as a 4954 // struct or something similar. 4955 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, KWLoc, *Name)) { 4956 bool SafeToContinue 4957 = (PrevTagDecl->getTagKind() != TagDecl::TK_enum && 4958 Kind != TagDecl::TK_enum); 4959 if (SafeToContinue) 4960 Diag(KWLoc, diag::err_use_with_wrong_tag) 4961 << Name 4962 << FixItHint::CreateReplacement(SourceRange(KWLoc), 4963 PrevTagDecl->getKindName()); 4964 else 4965 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 4966 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 4967 4968 if (SafeToContinue) 4969 Kind = PrevTagDecl->getTagKind(); 4970 else { 4971 // Recover by making this an anonymous redefinition. 4972 Name = 0; 4973 Previous.clear(); 4974 Invalid = true; 4975 } 4976 } 4977 4978 if (!Invalid) { 4979 // If this is a use, just return the declaration we found. 4980 4981 // FIXME: In the future, return a variant or some other clue 4982 // for the consumer of this Decl to know it doesn't own it. 4983 // For our current ASTs this shouldn't be a problem, but will 4984 // need to be changed with DeclGroups. 4985 if (TUK == TUK_Reference || TUK == TUK_Friend) 4986 return DeclPtrTy::make(PrevTagDecl); 4987 4988 // Diagnose attempts to redefine a tag. 4989 if (TUK == TUK_Definition) { 4990 if (TagDecl *Def = PrevTagDecl->getDefinition()) { 4991 // If we're defining a specialization and the previous definition 4992 // is from an implicit instantiation, don't emit an error 4993 // here; we'll catch this in the general case below. 4994 if (!isExplicitSpecialization || 4995 !isa<CXXRecordDecl>(Def) || 4996 cast<CXXRecordDecl>(Def)->getTemplateSpecializationKind() 4997 == TSK_ExplicitSpecialization) { 4998 Diag(NameLoc, diag::err_redefinition) << Name; 4999 Diag(Def->getLocation(), diag::note_previous_definition); 5000 // If this is a redefinition, recover by making this 5001 // struct be anonymous, which will make any later 5002 // references get the previous definition. 5003 Name = 0; 5004 Previous.clear(); 5005 Invalid = true; 5006 } 5007 } else { 5008 // If the type is currently being defined, complain 5009 // about a nested redefinition. 5010 TagType *Tag = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 5011 if (Tag->isBeingDefined()) { 5012 Diag(NameLoc, diag::err_nested_redefinition) << Name; 5013 Diag(PrevTagDecl->getLocation(), 5014 diag::note_previous_definition); 5015 Name = 0; 5016 Previous.clear(); 5017 Invalid = true; 5018 } 5019 } 5020 5021 // Okay, this is definition of a previously declared or referenced 5022 // tag PrevDecl. We're going to create a new Decl for it. 5023 } 5024 } 5025 // If we get here we have (another) forward declaration or we 5026 // have a definition. Just create a new decl. 5027 5028 } else { 5029 // If we get here, this is a definition of a new tag type in a nested 5030 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 5031 // new decl/type. We set PrevDecl to NULL so that the entities 5032 // have distinct types. 5033 Previous.clear(); 5034 } 5035 // If we get here, we're going to create a new Decl. If PrevDecl 5036 // is non-NULL, it's a definition of the tag declared by 5037 // PrevDecl. If it's NULL, we have a new definition. 5038 } else { 5039 // PrevDecl is a namespace, template, or anything else 5040 // that lives in the IDNS_Tag identifier namespace. 5041 if (TUK == TUK_Reference || TUK == TUK_Friend || 5042 isDeclInScope(PrevDecl, SearchDC, S)) { 5043 // The tag name clashes with a namespace name, issue an error and 5044 // recover by making this tag be anonymous. 5045 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 5046 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5047 Name = 0; 5048 Previous.clear(); 5049 Invalid = true; 5050 } else { 5051 // The existing declaration isn't relevant to us; we're in a 5052 // new scope, so clear out the previous declaration. 5053 Previous.clear(); 5054 } 5055 } 5056 } 5057 5058CreateNewDecl: 5059 5060 TagDecl *PrevDecl = 0; 5061 if (Previous.isSingleResult()) 5062 PrevDecl = cast<TagDecl>(Previous.getFoundDecl()); 5063 5064 // If there is an identifier, use the location of the identifier as the 5065 // location of the decl, otherwise use the location of the struct/union 5066 // keyword. 5067 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 5068 5069 // Otherwise, create a new declaration. If there is a previous 5070 // declaration of the same entity, the two will be linked via 5071 // PrevDecl. 5072 TagDecl *New; 5073 5074 if (Kind == TagDecl::TK_enum) { 5075 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 5076 // enum X { A, B, C } D; D should chain to X. 5077 New = EnumDecl::Create(Context, SearchDC, Loc, Name, KWLoc, 5078 cast_or_null<EnumDecl>(PrevDecl)); 5079 // If this is an undefined enum, warn. 5080 if (TUK != TUK_Definition && !Invalid) { 5081 unsigned DK = getLangOptions().CPlusPlus? diag::err_forward_ref_enum 5082 : diag::ext_forward_ref_enum; 5083 Diag(Loc, DK); 5084 } 5085 } else { 5086 // struct/union/class 5087 5088 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 5089 // struct X { int A; } D; D should chain to X. 5090 if (getLangOptions().CPlusPlus) { 5091 // FIXME: Look for a way to use RecordDecl for simple structs. 5092 New = CXXRecordDecl::Create(Context, Kind, SearchDC, Loc, Name, KWLoc, 5093 cast_or_null<CXXRecordDecl>(PrevDecl)); 5094 5095 if (isStdBadAlloc && (!StdBadAlloc || StdBadAlloc->isImplicit())) 5096 StdBadAlloc = cast<CXXRecordDecl>(New); 5097 } else 5098 New = RecordDecl::Create(Context, Kind, SearchDC, Loc, Name, KWLoc, 5099 cast_or_null<RecordDecl>(PrevDecl)); 5100 } 5101 5102 // Maybe add qualifier info. 5103 if (SS.isNotEmpty()) { 5104 NestedNameSpecifier *NNS 5105 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 5106 New->setQualifierInfo(NNS, SS.getRange()); 5107 } 5108 5109 if (Kind != TagDecl::TK_enum) { 5110 // Handle #pragma pack: if the #pragma pack stack has non-default 5111 // alignment, make up a packed attribute for this decl. These 5112 // attributes are checked when the ASTContext lays out the 5113 // structure. 5114 // 5115 // It is important for implementing the correct semantics that this 5116 // happen here (in act on tag decl). The #pragma pack stack is 5117 // maintained as a result of parser callbacks which can occur at 5118 // many points during the parsing of a struct declaration (because 5119 // the #pragma tokens are effectively skipped over during the 5120 // parsing of the struct). 5121 if (unsigned Alignment = getPragmaPackAlignment()) 5122 New->addAttr(::new (Context) PragmaPackAttr(Alignment * 8)); 5123 } 5124 5125 if (getLangOptions().CPlusPlus && SS.isEmpty() && Name && !Invalid) { 5126 // C++ [dcl.typedef]p3: 5127 // [...] Similarly, in a given scope, a class or enumeration 5128 // shall not be declared with the same name as a typedef-name 5129 // that is declared in that scope and refers to a type other 5130 // than the class or enumeration itself. 5131 LookupResult Lookup(*this, Name, NameLoc, LookupOrdinaryName, 5132 ForRedeclaration); 5133 LookupName(Lookup, S); 5134 TypedefDecl *PrevTypedef = Lookup.getAsSingle<TypedefDecl>(); 5135 NamedDecl *PrevTypedefNamed = PrevTypedef; 5136 if (PrevTypedef && isDeclInScope(PrevTypedefNamed, SearchDC, S) && 5137 Context.getCanonicalType(Context.getTypeDeclType(PrevTypedef)) != 5138 Context.getCanonicalType(Context.getTypeDeclType(New))) { 5139 Diag(Loc, diag::err_tag_definition_of_typedef) 5140 << Context.getTypeDeclType(New) 5141 << PrevTypedef->getUnderlyingType(); 5142 Diag(PrevTypedef->getLocation(), diag::note_previous_definition); 5143 Invalid = true; 5144 } 5145 } 5146 5147 // If this is a specialization of a member class (of a class template), 5148 // check the specialization. 5149 if (isExplicitSpecialization && CheckMemberSpecialization(New, Previous)) 5150 Invalid = true; 5151 5152 if (Invalid) 5153 New->setInvalidDecl(); 5154 5155 if (Attr) 5156 ProcessDeclAttributeList(S, New, Attr); 5157 5158 // If we're declaring or defining a tag in function prototype scope 5159 // in C, note that this type can only be used within the function. 5160 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus) 5161 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 5162 5163 // Set the lexical context. If the tag has a C++ scope specifier, the 5164 // lexical context will be different from the semantic context. 5165 New->setLexicalDeclContext(CurContext); 5166 5167 // Mark this as a friend decl if applicable. 5168 if (TUK == TUK_Friend) 5169 New->setObjectOfFriendDecl(/* PreviouslyDeclared = */ !Previous.empty()); 5170 5171 // Set the access specifier. 5172 if (!Invalid && SearchDC->isRecord()) 5173 SetMemberAccessSpecifier(New, PrevDecl, AS); 5174 5175 if (TUK == TUK_Definition) 5176 New->startDefinition(); 5177 5178 // If this has an identifier, add it to the scope stack. 5179 if (TUK == TUK_Friend) { 5180 // We might be replacing an existing declaration in the lookup tables; 5181 // if so, borrow its access specifier. 5182 if (PrevDecl) 5183 New->setAccess(PrevDecl->getAccess()); 5184 5185 DeclContext *DC = New->getDeclContext()->getLookupContext(); 5186 DC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 5187 if (Name) // can be null along some error paths 5188 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 5189 PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false); 5190 } else if (Name) { 5191 S = getNonFieldDeclScope(S); 5192 PushOnScopeChains(New, S); 5193 } else { 5194 CurContext->addDecl(New); 5195 } 5196 5197 // If this is the C FILE type, notify the AST context. 5198 if (IdentifierInfo *II = New->getIdentifier()) 5199 if (!New->isInvalidDecl() && 5200 New->getDeclContext()->getLookupContext()->isTranslationUnit() && 5201 II->isStr("FILE")) 5202 Context.setFILEDecl(New); 5203 5204 OwnedDecl = true; 5205 return DeclPtrTy::make(New); 5206} 5207 5208void Sema::ActOnTagStartDefinition(Scope *S, DeclPtrTy TagD) { 5209 AdjustDeclIfTemplate(TagD); 5210 TagDecl *Tag = cast<TagDecl>(TagD.getAs<Decl>()); 5211 5212 // Enter the tag context. 5213 PushDeclContext(S, Tag); 5214} 5215 5216void Sema::ActOnStartCXXMemberDeclarations(Scope *S, DeclPtrTy TagD, 5217 SourceLocation LBraceLoc) { 5218 AdjustDeclIfTemplate(TagD); 5219 CXXRecordDecl *Record = cast<CXXRecordDecl>(TagD.getAs<Decl>()); 5220 5221 FieldCollector->StartClass(); 5222 5223 if (!Record->getIdentifier()) 5224 return; 5225 5226 // C++ [class]p2: 5227 // [...] The class-name is also inserted into the scope of the 5228 // class itself; this is known as the injected-class-name. For 5229 // purposes of access checking, the injected-class-name is treated 5230 // as if it were a public member name. 5231 CXXRecordDecl *InjectedClassName 5232 = CXXRecordDecl::Create(Context, Record->getTagKind(), 5233 CurContext, Record->getLocation(), 5234 Record->getIdentifier(), 5235 Record->getTagKeywordLoc(), 5236 Record); 5237 InjectedClassName->setImplicit(); 5238 InjectedClassName->setAccess(AS_public); 5239 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate()) 5240 InjectedClassName->setDescribedClassTemplate(Template); 5241 PushOnScopeChains(InjectedClassName, S); 5242 assert(InjectedClassName->isInjectedClassName() && 5243 "Broken injected-class-name"); 5244} 5245 5246// Traverses the class and any nested classes, making a note of any 5247// dynamic classes that have no key function so that we can mark all of 5248// their virtual member functions as "used" at the end of the translation 5249// unit. This ensures that all functions needed by the vtable will get 5250// instantiated/synthesized. 5251static void 5252RecordDynamicClassesWithNoKeyFunction(Sema &S, CXXRecordDecl *Record, 5253 SourceLocation Loc) { 5254 // We don't look at dependent or undefined classes. 5255 if (Record->isDependentContext() || !Record->isDefinition()) 5256 return; 5257 5258 if (Record->isDynamicClass()) { 5259 const CXXMethodDecl *KeyFunction = S.Context.getKeyFunction(Record); 5260 5261 if (!KeyFunction) 5262 S.ClassesWithUnmarkedVirtualMembers.push_back(std::make_pair(Record, 5263 Loc)); 5264 5265 if ((!KeyFunction || (KeyFunction->getBody() && KeyFunction->isInlined())) 5266 && Record->getLinkage() == ExternalLinkage) 5267 S.Diag(Record->getLocation(), diag::warn_weak_vtable) << Record; 5268 } 5269 for (DeclContext::decl_iterator D = Record->decls_begin(), 5270 DEnd = Record->decls_end(); 5271 D != DEnd; ++D) { 5272 if (CXXRecordDecl *Nested = dyn_cast<CXXRecordDecl>(*D)) 5273 RecordDynamicClassesWithNoKeyFunction(S, Nested, Loc); 5274 } 5275} 5276 5277void Sema::ActOnTagFinishDefinition(Scope *S, DeclPtrTy TagD, 5278 SourceLocation RBraceLoc) { 5279 AdjustDeclIfTemplate(TagD); 5280 TagDecl *Tag = cast<TagDecl>(TagD.getAs<Decl>()); 5281 Tag->setRBraceLoc(RBraceLoc); 5282 5283 if (isa<CXXRecordDecl>(Tag)) 5284 FieldCollector->FinishClass(); 5285 5286 // Exit this scope of this tag's definition. 5287 PopDeclContext(); 5288 5289 if (isa<CXXRecordDecl>(Tag) && !Tag->getLexicalDeclContext()->isRecord()) 5290 RecordDynamicClassesWithNoKeyFunction(*this, cast<CXXRecordDecl>(Tag), 5291 RBraceLoc); 5292 5293 // Notify the consumer that we've defined a tag. 5294 Consumer.HandleTagDeclDefinition(Tag); 5295} 5296 5297void Sema::ActOnTagDefinitionError(Scope *S, DeclPtrTy TagD) { 5298 AdjustDeclIfTemplate(TagD); 5299 TagDecl *Tag = cast<TagDecl>(TagD.getAs<Decl>()); 5300 Tag->setInvalidDecl(); 5301 5302 // We're undoing ActOnTagStartDefinition here, not 5303 // ActOnStartCXXMemberDeclarations, so we don't have to mess with 5304 // the FieldCollector. 5305 5306 PopDeclContext(); 5307} 5308 5309// Note that FieldName may be null for anonymous bitfields. 5310bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName, 5311 QualType FieldTy, const Expr *BitWidth, 5312 bool *ZeroWidth) { 5313 // Default to true; that shouldn't confuse checks for emptiness 5314 if (ZeroWidth) 5315 *ZeroWidth = true; 5316 5317 // C99 6.7.2.1p4 - verify the field type. 5318 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 5319 if (!FieldTy->isDependentType() && !FieldTy->isIntegralType()) { 5320 // Handle incomplete types with specific error. 5321 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 5322 return true; 5323 if (FieldName) 5324 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 5325 << FieldName << FieldTy << BitWidth->getSourceRange(); 5326 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield) 5327 << FieldTy << BitWidth->getSourceRange(); 5328 } 5329 5330 // If the bit-width is type- or value-dependent, don't try to check 5331 // it now. 5332 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 5333 return false; 5334 5335 llvm::APSInt Value; 5336 if (VerifyIntegerConstantExpression(BitWidth, &Value)) 5337 return true; 5338 5339 if (Value != 0 && ZeroWidth) 5340 *ZeroWidth = false; 5341 5342 // Zero-width bitfield is ok for anonymous field. 5343 if (Value == 0 && FieldName) 5344 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 5345 5346 if (Value.isSigned() && Value.isNegative()) { 5347 if (FieldName) 5348 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) 5349 << FieldName << Value.toString(10); 5350 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width) 5351 << Value.toString(10); 5352 } 5353 5354 if (!FieldTy->isDependentType()) { 5355 uint64_t TypeSize = Context.getTypeSize(FieldTy); 5356 if (Value.getZExtValue() > TypeSize) { 5357 if (FieldName) 5358 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 5359 << FieldName << (unsigned)TypeSize; 5360 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size) 5361 << (unsigned)TypeSize; 5362 } 5363 } 5364 5365 return false; 5366} 5367 5368/// ActOnField - Each field of a struct/union/class is passed into this in order 5369/// to create a FieldDecl object for it. 5370Sema::DeclPtrTy Sema::ActOnField(Scope *S, DeclPtrTy TagD, 5371 SourceLocation DeclStart, 5372 Declarator &D, ExprTy *BitfieldWidth) { 5373 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD.getAs<Decl>()), 5374 DeclStart, D, static_cast<Expr*>(BitfieldWidth), 5375 AS_public); 5376 return DeclPtrTy::make(Res); 5377} 5378 5379/// HandleField - Analyze a field of a C struct or a C++ data member. 5380/// 5381FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 5382 SourceLocation DeclStart, 5383 Declarator &D, Expr *BitWidth, 5384 AccessSpecifier AS) { 5385 IdentifierInfo *II = D.getIdentifier(); 5386 SourceLocation Loc = DeclStart; 5387 if (II) Loc = D.getIdentifierLoc(); 5388 5389 TypeSourceInfo *TInfo = 0; 5390 QualType T = GetTypeForDeclarator(D, S, &TInfo); 5391 if (getLangOptions().CPlusPlus) 5392 CheckExtraCXXDefaultArguments(D); 5393 5394 DiagnoseFunctionSpecifiers(D); 5395 5396 if (D.getDeclSpec().isThreadSpecified()) 5397 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 5398 5399 NamedDecl *PrevDecl = LookupSingleName(S, II, LookupMemberName, 5400 ForRedeclaration); 5401 5402 if (PrevDecl && PrevDecl->isTemplateParameter()) { 5403 // Maybe we will complain about the shadowed template parameter. 5404 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 5405 // Just pretend that we didn't see the previous declaration. 5406 PrevDecl = 0; 5407 } 5408 5409 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 5410 PrevDecl = 0; 5411 5412 bool Mutable 5413 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable); 5414 SourceLocation TSSL = D.getSourceRange().getBegin(); 5415 FieldDecl *NewFD 5416 = CheckFieldDecl(II, T, TInfo, Record, Loc, Mutable, BitWidth, TSSL, 5417 AS, PrevDecl, &D); 5418 5419 if (NewFD->isInvalidDecl()) 5420 Record->setInvalidDecl(); 5421 5422 if (NewFD->isInvalidDecl() && PrevDecl) { 5423 // Don't introduce NewFD into scope; there's already something 5424 // with the same name in the same scope. 5425 } else if (II) { 5426 PushOnScopeChains(NewFD, S); 5427 } else 5428 Record->addDecl(NewFD); 5429 5430 return NewFD; 5431} 5432 5433/// \brief Build a new FieldDecl and check its well-formedness. 5434/// 5435/// This routine builds a new FieldDecl given the fields name, type, 5436/// record, etc. \p PrevDecl should refer to any previous declaration 5437/// with the same name and in the same scope as the field to be 5438/// created. 5439/// 5440/// \returns a new FieldDecl. 5441/// 5442/// \todo The Declarator argument is a hack. It will be removed once 5443FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 5444 TypeSourceInfo *TInfo, 5445 RecordDecl *Record, SourceLocation Loc, 5446 bool Mutable, Expr *BitWidth, 5447 SourceLocation TSSL, 5448 AccessSpecifier AS, NamedDecl *PrevDecl, 5449 Declarator *D) { 5450 IdentifierInfo *II = Name.getAsIdentifierInfo(); 5451 bool InvalidDecl = false; 5452 if (D) InvalidDecl = D->isInvalidType(); 5453 5454 // If we receive a broken type, recover by assuming 'int' and 5455 // marking this declaration as invalid. 5456 if (T.isNull()) { 5457 InvalidDecl = true; 5458 T = Context.IntTy; 5459 } 5460 5461 QualType EltTy = Context.getBaseElementType(T); 5462 if (!EltTy->isDependentType() && 5463 RequireCompleteType(Loc, EltTy, diag::err_field_incomplete)) 5464 InvalidDecl = true; 5465 5466 // C99 6.7.2.1p8: A member of a structure or union may have any type other 5467 // than a variably modified type. 5468 if (!InvalidDecl && T->isVariablyModifiedType()) { 5469 bool SizeIsNegative; 5470 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 5471 SizeIsNegative); 5472 if (!FixedTy.isNull()) { 5473 Diag(Loc, diag::warn_illegal_constant_array_size); 5474 T = FixedTy; 5475 } else { 5476 if (SizeIsNegative) 5477 Diag(Loc, diag::err_typecheck_negative_array_size); 5478 else 5479 Diag(Loc, diag::err_typecheck_field_variable_size); 5480 InvalidDecl = true; 5481 } 5482 } 5483 5484 // Fields can not have abstract class types 5485 if (!InvalidDecl && RequireNonAbstractType(Loc, T, 5486 diag::err_abstract_type_in_decl, 5487 AbstractFieldType)) 5488 InvalidDecl = true; 5489 5490 bool ZeroWidth = false; 5491 // If this is declared as a bit-field, check the bit-field. 5492 if (!InvalidDecl && BitWidth && 5493 VerifyBitField(Loc, II, T, BitWidth, &ZeroWidth)) { 5494 InvalidDecl = true; 5495 DeleteExpr(BitWidth); 5496 BitWidth = 0; 5497 ZeroWidth = false; 5498 } 5499 5500 FieldDecl *NewFD = FieldDecl::Create(Context, Record, Loc, II, T, TInfo, 5501 BitWidth, Mutable); 5502 if (InvalidDecl) 5503 NewFD->setInvalidDecl(); 5504 5505 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 5506 Diag(Loc, diag::err_duplicate_member) << II; 5507 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 5508 NewFD->setInvalidDecl(); 5509 } 5510 5511 if (!InvalidDecl && getLangOptions().CPlusPlus) { 5512 CXXRecordDecl* CXXRecord = cast<CXXRecordDecl>(Record); 5513 5514 if (!T->isPODType()) 5515 CXXRecord->setPOD(false); 5516 if (!ZeroWidth) 5517 CXXRecord->setEmpty(false); 5518 5519 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 5520 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 5521 5522 if (!RDecl->hasTrivialConstructor()) 5523 CXXRecord->setHasTrivialConstructor(false); 5524 if (!RDecl->hasTrivialCopyConstructor()) 5525 CXXRecord->setHasTrivialCopyConstructor(false); 5526 if (!RDecl->hasTrivialCopyAssignment()) 5527 CXXRecord->setHasTrivialCopyAssignment(false); 5528 if (!RDecl->hasTrivialDestructor()) 5529 CXXRecord->setHasTrivialDestructor(false); 5530 5531 // C++ 9.5p1: An object of a class with a non-trivial 5532 // constructor, a non-trivial copy constructor, a non-trivial 5533 // destructor, or a non-trivial copy assignment operator 5534 // cannot be a member of a union, nor can an array of such 5535 // objects. 5536 // TODO: C++0x alters this restriction significantly. 5537 if (Record->isUnion()) { 5538 // We check for copy constructors before constructors 5539 // because otherwise we'll never get complaints about 5540 // copy constructors. 5541 5542 const CXXSpecialMember invalid = (CXXSpecialMember) -1; 5543 5544 CXXSpecialMember member; 5545 if (!RDecl->hasTrivialCopyConstructor()) 5546 member = CXXCopyConstructor; 5547 else if (!RDecl->hasTrivialConstructor()) 5548 member = CXXDefaultConstructor; 5549 else if (!RDecl->hasTrivialCopyAssignment()) 5550 member = CXXCopyAssignment; 5551 else if (!RDecl->hasTrivialDestructor()) 5552 member = CXXDestructor; 5553 else 5554 member = invalid; 5555 5556 if (member != invalid) { 5557 Diag(Loc, diag::err_illegal_union_member) << Name << member; 5558 DiagnoseNontrivial(RT, member); 5559 NewFD->setInvalidDecl(); 5560 } 5561 } 5562 } 5563 } 5564 5565 // FIXME: We need to pass in the attributes given an AST 5566 // representation, not a parser representation. 5567 if (D) 5568 // FIXME: What to pass instead of TUScope? 5569 ProcessDeclAttributes(TUScope, NewFD, *D); 5570 5571 if (T.isObjCGCWeak()) 5572 Diag(Loc, diag::warn_attribute_weak_on_field); 5573 5574 NewFD->setAccess(AS); 5575 5576 // C++ [dcl.init.aggr]p1: 5577 // An aggregate is an array or a class (clause 9) with [...] no 5578 // private or protected non-static data members (clause 11). 5579 // A POD must be an aggregate. 5580 if (getLangOptions().CPlusPlus && 5581 (AS == AS_private || AS == AS_protected)) { 5582 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record); 5583 CXXRecord->setAggregate(false); 5584 CXXRecord->setPOD(false); 5585 } 5586 5587 return NewFD; 5588} 5589 5590/// DiagnoseNontrivial - Given that a class has a non-trivial 5591/// special member, figure out why. 5592void Sema::DiagnoseNontrivial(const RecordType* T, CXXSpecialMember member) { 5593 QualType QT(T, 0U); 5594 CXXRecordDecl* RD = cast<CXXRecordDecl>(T->getDecl()); 5595 5596 // Check whether the member was user-declared. 5597 switch (member) { 5598 case CXXDefaultConstructor: 5599 if (RD->hasUserDeclaredConstructor()) { 5600 typedef CXXRecordDecl::ctor_iterator ctor_iter; 5601 for (ctor_iter ci = RD->ctor_begin(), ce = RD->ctor_end(); ci != ce;++ci){ 5602 const FunctionDecl *body = 0; 5603 ci->getBody(body); 5604 if (!body || 5605 !cast<CXXConstructorDecl>(body)->isImplicitlyDefined(Context)) { 5606 SourceLocation CtorLoc = ci->getLocation(); 5607 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 5608 return; 5609 } 5610 } 5611 5612 assert(0 && "found no user-declared constructors"); 5613 return; 5614 } 5615 break; 5616 5617 case CXXCopyConstructor: 5618 if (RD->hasUserDeclaredCopyConstructor()) { 5619 SourceLocation CtorLoc = 5620 RD->getCopyConstructor(Context, 0)->getLocation(); 5621 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 5622 return; 5623 } 5624 break; 5625 5626 case CXXCopyAssignment: 5627 if (RD->hasUserDeclaredCopyAssignment()) { 5628 // FIXME: this should use the location of the copy 5629 // assignment, not the type. 5630 SourceLocation TyLoc = RD->getSourceRange().getBegin(); 5631 Diag(TyLoc, diag::note_nontrivial_user_defined) << QT << member; 5632 return; 5633 } 5634 break; 5635 5636 case CXXDestructor: 5637 if (RD->hasUserDeclaredDestructor()) { 5638 SourceLocation DtorLoc = RD->getDestructor(Context)->getLocation(); 5639 Diag(DtorLoc, diag::note_nontrivial_user_defined) << QT << member; 5640 return; 5641 } 5642 break; 5643 } 5644 5645 typedef CXXRecordDecl::base_class_iterator base_iter; 5646 5647 // Virtual bases and members inhibit trivial copying/construction, 5648 // but not trivial destruction. 5649 if (member != CXXDestructor) { 5650 // Check for virtual bases. vbases includes indirect virtual bases, 5651 // so we just iterate through the direct bases. 5652 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) 5653 if (bi->isVirtual()) { 5654 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 5655 Diag(BaseLoc, diag::note_nontrivial_has_virtual) << QT << 1; 5656 return; 5657 } 5658 5659 // Check for virtual methods. 5660 typedef CXXRecordDecl::method_iterator meth_iter; 5661 for (meth_iter mi = RD->method_begin(), me = RD->method_end(); mi != me; 5662 ++mi) { 5663 if (mi->isVirtual()) { 5664 SourceLocation MLoc = mi->getSourceRange().getBegin(); 5665 Diag(MLoc, diag::note_nontrivial_has_virtual) << QT << 0; 5666 return; 5667 } 5668 } 5669 } 5670 5671 bool (CXXRecordDecl::*hasTrivial)() const; 5672 switch (member) { 5673 case CXXDefaultConstructor: 5674 hasTrivial = &CXXRecordDecl::hasTrivialConstructor; break; 5675 case CXXCopyConstructor: 5676 hasTrivial = &CXXRecordDecl::hasTrivialCopyConstructor; break; 5677 case CXXCopyAssignment: 5678 hasTrivial = &CXXRecordDecl::hasTrivialCopyAssignment; break; 5679 case CXXDestructor: 5680 hasTrivial = &CXXRecordDecl::hasTrivialDestructor; break; 5681 default: 5682 assert(0 && "unexpected special member"); return; 5683 } 5684 5685 // Check for nontrivial bases (and recurse). 5686 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) { 5687 const RecordType *BaseRT = bi->getType()->getAs<RecordType>(); 5688 assert(BaseRT && "Don't know how to handle dependent bases"); 5689 CXXRecordDecl *BaseRecTy = cast<CXXRecordDecl>(BaseRT->getDecl()); 5690 if (!(BaseRecTy->*hasTrivial)()) { 5691 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 5692 Diag(BaseLoc, diag::note_nontrivial_has_nontrivial) << QT << 1 << member; 5693 DiagnoseNontrivial(BaseRT, member); 5694 return; 5695 } 5696 } 5697 5698 // Check for nontrivial members (and recurse). 5699 typedef RecordDecl::field_iterator field_iter; 5700 for (field_iter fi = RD->field_begin(), fe = RD->field_end(); fi != fe; 5701 ++fi) { 5702 QualType EltTy = Context.getBaseElementType((*fi)->getType()); 5703 if (const RecordType *EltRT = EltTy->getAs<RecordType>()) { 5704 CXXRecordDecl* EltRD = cast<CXXRecordDecl>(EltRT->getDecl()); 5705 5706 if (!(EltRD->*hasTrivial)()) { 5707 SourceLocation FLoc = (*fi)->getLocation(); 5708 Diag(FLoc, diag::note_nontrivial_has_nontrivial) << QT << 0 << member; 5709 DiagnoseNontrivial(EltRT, member); 5710 return; 5711 } 5712 } 5713 } 5714 5715 assert(0 && "found no explanation for non-trivial member"); 5716} 5717 5718/// TranslateIvarVisibility - Translate visibility from a token ID to an 5719/// AST enum value. 5720static ObjCIvarDecl::AccessControl 5721TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 5722 switch (ivarVisibility) { 5723 default: assert(0 && "Unknown visitibility kind"); 5724 case tok::objc_private: return ObjCIvarDecl::Private; 5725 case tok::objc_public: return ObjCIvarDecl::Public; 5726 case tok::objc_protected: return ObjCIvarDecl::Protected; 5727 case tok::objc_package: return ObjCIvarDecl::Package; 5728 } 5729} 5730 5731/// ActOnIvar - Each ivar field of an objective-c class is passed into this 5732/// in order to create an IvarDecl object for it. 5733Sema::DeclPtrTy Sema::ActOnIvar(Scope *S, 5734 SourceLocation DeclStart, 5735 DeclPtrTy IntfDecl, 5736 Declarator &D, ExprTy *BitfieldWidth, 5737 tok::ObjCKeywordKind Visibility) { 5738 5739 IdentifierInfo *II = D.getIdentifier(); 5740 Expr *BitWidth = (Expr*)BitfieldWidth; 5741 SourceLocation Loc = DeclStart; 5742 if (II) Loc = D.getIdentifierLoc(); 5743 5744 // FIXME: Unnamed fields can be handled in various different ways, for 5745 // example, unnamed unions inject all members into the struct namespace! 5746 5747 TypeSourceInfo *TInfo = 0; 5748 QualType T = GetTypeForDeclarator(D, S, &TInfo); 5749 5750 if (BitWidth) { 5751 // 6.7.2.1p3, 6.7.2.1p4 5752 if (VerifyBitField(Loc, II, T, BitWidth)) { 5753 D.setInvalidType(); 5754 DeleteExpr(BitWidth); 5755 BitWidth = 0; 5756 } 5757 } else { 5758 // Not a bitfield. 5759 5760 // validate II. 5761 5762 } 5763 5764 // C99 6.7.2.1p8: A member of a structure or union may have any type other 5765 // than a variably modified type. 5766 if (T->isVariablyModifiedType()) { 5767 Diag(Loc, diag::err_typecheck_ivar_variable_size); 5768 D.setInvalidType(); 5769 } 5770 5771 // Get the visibility (access control) for this ivar. 5772 ObjCIvarDecl::AccessControl ac = 5773 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 5774 : ObjCIvarDecl::None; 5775 // Must set ivar's DeclContext to its enclosing interface. 5776 ObjCContainerDecl *EnclosingDecl = IntfDecl.getAs<ObjCContainerDecl>(); 5777 ObjCContainerDecl *EnclosingContext; 5778 if (ObjCImplementationDecl *IMPDecl = 5779 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 5780 // Case of ivar declared in an implementation. Context is that of its class. 5781 EnclosingContext = IMPDecl->getClassInterface(); 5782 assert(EnclosingContext && "Implementation has no class interface!"); 5783 } else { 5784 if (ObjCCategoryDecl *CDecl = 5785 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 5786 if (!LangOpts.ObjCNonFragileABI2 || !CDecl->IsClassExtension()) { 5787 Diag(Loc, diag::err_misplaced_ivar) << CDecl->IsClassExtension(); 5788 return DeclPtrTy(); 5789 } 5790 } 5791 EnclosingContext = EnclosingDecl; 5792 } 5793 5794 // Construct the decl. 5795 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, 5796 EnclosingContext, Loc, II, T, 5797 TInfo, ac, (Expr *)BitfieldWidth); 5798 5799 if (II) { 5800 NamedDecl *PrevDecl = LookupSingleName(S, II, LookupMemberName, 5801 ForRedeclaration); 5802 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S) 5803 && !isa<TagDecl>(PrevDecl)) { 5804 Diag(Loc, diag::err_duplicate_member) << II; 5805 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 5806 NewID->setInvalidDecl(); 5807 } 5808 } 5809 5810 // Process attributes attached to the ivar. 5811 ProcessDeclAttributes(S, NewID, D); 5812 5813 if (D.isInvalidType()) 5814 NewID->setInvalidDecl(); 5815 5816 if (II) { 5817 // FIXME: When interfaces are DeclContexts, we'll need to add 5818 // these to the interface. 5819 S->AddDecl(DeclPtrTy::make(NewID)); 5820 IdResolver.AddDecl(NewID); 5821 } 5822 5823 return DeclPtrTy::make(NewID); 5824} 5825 5826void Sema::ActOnFields(Scope* S, 5827 SourceLocation RecLoc, DeclPtrTy RecDecl, 5828 DeclPtrTy *Fields, unsigned NumFields, 5829 SourceLocation LBrac, SourceLocation RBrac, 5830 AttributeList *Attr) { 5831 Decl *EnclosingDecl = RecDecl.getAs<Decl>(); 5832 assert(EnclosingDecl && "missing record or interface decl"); 5833 5834 // If the decl this is being inserted into is invalid, then it may be a 5835 // redeclaration or some other bogus case. Don't try to add fields to it. 5836 if (EnclosingDecl->isInvalidDecl()) { 5837 // FIXME: Deallocate fields? 5838 return; 5839 } 5840 5841 5842 // Verify that all the fields are okay. 5843 unsigned NumNamedMembers = 0; 5844 llvm::SmallVector<FieldDecl*, 32> RecFields; 5845 5846 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 5847 for (unsigned i = 0; i != NumFields; ++i) { 5848 FieldDecl *FD = cast<FieldDecl>(Fields[i].getAs<Decl>()); 5849 5850 // Get the type for the field. 5851 Type *FDTy = FD->getType().getTypePtr(); 5852 5853 if (!FD->isAnonymousStructOrUnion()) { 5854 // Remember all fields written by the user. 5855 RecFields.push_back(FD); 5856 } 5857 5858 // If the field is already invalid for some reason, don't emit more 5859 // diagnostics about it. 5860 if (FD->isInvalidDecl()) { 5861 EnclosingDecl->setInvalidDecl(); 5862 continue; 5863 } 5864 5865 // C99 6.7.2.1p2: 5866 // A structure or union shall not contain a member with 5867 // incomplete or function type (hence, a structure shall not 5868 // contain an instance of itself, but may contain a pointer to 5869 // an instance of itself), except that the last member of a 5870 // structure with more than one named member may have incomplete 5871 // array type; such a structure (and any union containing, 5872 // possibly recursively, a member that is such a structure) 5873 // shall not be a member of a structure or an element of an 5874 // array. 5875 if (FDTy->isFunctionType()) { 5876 // Field declared as a function. 5877 Diag(FD->getLocation(), diag::err_field_declared_as_function) 5878 << FD->getDeclName(); 5879 FD->setInvalidDecl(); 5880 EnclosingDecl->setInvalidDecl(); 5881 continue; 5882 } else if (FDTy->isIncompleteArrayType() && i == NumFields - 1 && 5883 Record && Record->isStruct()) { 5884 // Flexible array member. 5885 if (NumNamedMembers < 1) { 5886 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 5887 << FD->getDeclName(); 5888 FD->setInvalidDecl(); 5889 EnclosingDecl->setInvalidDecl(); 5890 continue; 5891 } 5892 // Okay, we have a legal flexible array member at the end of the struct. 5893 if (Record) 5894 Record->setHasFlexibleArrayMember(true); 5895 } else if (!FDTy->isDependentType() && 5896 RequireCompleteType(FD->getLocation(), FD->getType(), 5897 diag::err_field_incomplete)) { 5898 // Incomplete type 5899 FD->setInvalidDecl(); 5900 EnclosingDecl->setInvalidDecl(); 5901 continue; 5902 } else if (const RecordType *FDTTy = FDTy->getAs<RecordType>()) { 5903 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 5904 // If this is a member of a union, then entire union becomes "flexible". 5905 if (Record && Record->isUnion()) { 5906 Record->setHasFlexibleArrayMember(true); 5907 } else { 5908 // If this is a struct/class and this is not the last element, reject 5909 // it. Note that GCC supports variable sized arrays in the middle of 5910 // structures. 5911 if (i != NumFields-1) 5912 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 5913 << FD->getDeclName() << FD->getType(); 5914 else { 5915 // We support flexible arrays at the end of structs in 5916 // other structs as an extension. 5917 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 5918 << FD->getDeclName(); 5919 if (Record) 5920 Record->setHasFlexibleArrayMember(true); 5921 } 5922 } 5923 } 5924 if (Record && FDTTy->getDecl()->hasObjectMember()) 5925 Record->setHasObjectMember(true); 5926 } else if (FDTy->isObjCInterfaceType()) { 5927 /// A field cannot be an Objective-c object 5928 Diag(FD->getLocation(), diag::err_statically_allocated_object); 5929 FD->setInvalidDecl(); 5930 EnclosingDecl->setInvalidDecl(); 5931 continue; 5932 } else if (getLangOptions().ObjC1 && 5933 getLangOptions().getGCMode() != LangOptions::NonGC && 5934 Record && 5935 (FD->getType()->isObjCObjectPointerType() || 5936 FD->getType().isObjCGCStrong())) 5937 Record->setHasObjectMember(true); 5938 // Keep track of the number of named members. 5939 if (FD->getIdentifier()) 5940 ++NumNamedMembers; 5941 } 5942 5943 // Okay, we successfully defined 'Record'. 5944 if (Record) { 5945 Record->completeDefinition(); 5946 } else { 5947 ObjCIvarDecl **ClsFields = 5948 reinterpret_cast<ObjCIvarDecl**>(RecFields.data()); 5949 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 5950 ID->setLocEnd(RBrac); 5951 // Add ivar's to class's DeclContext. 5952 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 5953 ClsFields[i]->setLexicalDeclContext(ID); 5954 ID->addDecl(ClsFields[i]); 5955 } 5956 // Must enforce the rule that ivars in the base classes may not be 5957 // duplicates. 5958 if (ID->getSuperClass()) 5959 DiagnoseDuplicateIvars(ID, ID->getSuperClass()); 5960 } else if (ObjCImplementationDecl *IMPDecl = 5961 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 5962 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 5963 for (unsigned I = 0, N = RecFields.size(); I != N; ++I) 5964 // Ivar declared in @implementation never belongs to the implementation. 5965 // Only it is in implementation's lexical context. 5966 ClsFields[I]->setLexicalDeclContext(IMPDecl); 5967 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 5968 } else if (ObjCCategoryDecl *CDecl = 5969 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 5970 // case of ivars in class extension; all other cases have been 5971 // reported as errors elsewhere. 5972 // FIXME. Class extension does not have a LocEnd field. 5973 // CDecl->setLocEnd(RBrac); 5974 // Add ivar's to class extension's DeclContext. 5975 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 5976 ClsFields[i]->setLexicalDeclContext(CDecl); 5977 CDecl->addDecl(ClsFields[i]); 5978 } 5979 } 5980 } 5981 5982 if (Attr) 5983 ProcessDeclAttributeList(S, Record, Attr); 5984} 5985 5986/// \brief Determine whether the given integral value is representable within 5987/// the given type T. 5988static bool isRepresentableIntegerValue(ASTContext &Context, 5989 llvm::APSInt &Value, 5990 QualType T) { 5991 assert(T->isIntegralType() && "Integral type required!"); 5992 unsigned BitWidth = Context.getTypeSize(T); 5993 5994 if (Value.isUnsigned() || Value.isNonNegative()) 5995 return Value.getActiveBits() < BitWidth; 5996 5997 return Value.getMinSignedBits() <= BitWidth; 5998} 5999 6000// \brief Given an integral type, return the next larger integral type 6001// (or a NULL type of no such type exists). 6002static QualType getNextLargerIntegralType(ASTContext &Context, QualType T) { 6003 // FIXME: Int128/UInt128 support, which also needs to be introduced into 6004 // enum checking below. 6005 assert(T->isIntegralType() && "Integral type required!"); 6006 const unsigned NumTypes = 4; 6007 QualType SignedIntegralTypes[NumTypes] = { 6008 Context.ShortTy, Context.IntTy, Context.LongTy, Context.LongLongTy 6009 }; 6010 QualType UnsignedIntegralTypes[NumTypes] = { 6011 Context.UnsignedShortTy, Context.UnsignedIntTy, Context.UnsignedLongTy, 6012 Context.UnsignedLongLongTy 6013 }; 6014 6015 unsigned BitWidth = Context.getTypeSize(T); 6016 QualType *Types = T->isSignedIntegerType()? SignedIntegralTypes 6017 : UnsignedIntegralTypes; 6018 for (unsigned I = 0; I != NumTypes; ++I) 6019 if (Context.getTypeSize(Types[I]) > BitWidth) 6020 return Types[I]; 6021 6022 return QualType(); 6023} 6024 6025EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, 6026 EnumConstantDecl *LastEnumConst, 6027 SourceLocation IdLoc, 6028 IdentifierInfo *Id, 6029 ExprArg val) { 6030 Expr *Val = (Expr *)val.get(); 6031 6032 unsigned IntWidth = Context.Target.getIntWidth(); 6033 llvm::APSInt EnumVal(IntWidth); 6034 QualType EltTy; 6035 if (Val) { 6036 if (Enum->isDependentType() || Val->isTypeDependent()) 6037 EltTy = Context.DependentTy; 6038 else { 6039 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 6040 SourceLocation ExpLoc; 6041 if (!Val->isValueDependent() && 6042 VerifyIntegerConstantExpression(Val, &EnumVal)) { 6043 Val = 0; 6044 } else { 6045 if (!getLangOptions().CPlusPlus) { 6046 // C99 6.7.2.2p2: 6047 // The expression that defines the value of an enumeration constant 6048 // shall be an integer constant expression that has a value 6049 // representable as an int. 6050 6051 // Complain if the value is not representable in an int. 6052 if (!isRepresentableIntegerValue(Context, EnumVal, Context.IntTy)) 6053 Diag(IdLoc, diag::ext_enum_value_not_int) 6054 << EnumVal.toString(10) << Val->getSourceRange() 6055 << (EnumVal.isUnsigned() || EnumVal.isNonNegative()); 6056 else if (!Context.hasSameType(Val->getType(), Context.IntTy)) { 6057 // Force the type of the expression to 'int'. 6058 ImpCastExprToType(Val, Context.IntTy, CastExpr::CK_IntegralCast); 6059 6060 if (Val != val.get()) { 6061 val.release(); 6062 val = Val; 6063 } 6064 } 6065 } 6066 6067 // C++0x [dcl.enum]p5: 6068 // If the underlying type is not fixed, the type of each enumerator 6069 // is the type of its initializing value: 6070 // - If an initializer is specified for an enumerator, the 6071 // initializing value has the same type as the expression. 6072 EltTy = Val->getType(); 6073 } 6074 } 6075 } 6076 6077 if (!Val) { 6078 if (Enum->isDependentType()) 6079 EltTy = Context.DependentTy; 6080 else if (!LastEnumConst) { 6081 // C++0x [dcl.enum]p5: 6082 // If the underlying type is not fixed, the type of each enumerator 6083 // is the type of its initializing value: 6084 // - If no initializer is specified for the first enumerator, the 6085 // initializing value has an unspecified integral type. 6086 // 6087 // GCC uses 'int' for its unspecified integral type, as does 6088 // C99 6.7.2.2p3. 6089 EltTy = Context.IntTy; 6090 } else { 6091 // Assign the last value + 1. 6092 EnumVal = LastEnumConst->getInitVal(); 6093 ++EnumVal; 6094 EltTy = LastEnumConst->getType(); 6095 6096 // Check for overflow on increment. 6097 if (EnumVal < LastEnumConst->getInitVal()) { 6098 // C++0x [dcl.enum]p5: 6099 // If the underlying type is not fixed, the type of each enumerator 6100 // is the type of its initializing value: 6101 // 6102 // - Otherwise the type of the initializing value is the same as 6103 // the type of the initializing value of the preceding enumerator 6104 // unless the incremented value is not representable in that type, 6105 // in which case the type is an unspecified integral type 6106 // sufficient to contain the incremented value. If no such type 6107 // exists, the program is ill-formed. 6108 QualType T = getNextLargerIntegralType(Context, EltTy); 6109 if (T.isNull()) { 6110 // There is no integral type larger enough to represent this 6111 // value. Complain, then allow the value to wrap around. 6112 EnumVal = LastEnumConst->getInitVal(); 6113 EnumVal.zext(EnumVal.getBitWidth() * 2); 6114 Diag(IdLoc, diag::warn_enumerator_too_large) 6115 << EnumVal.toString(10); 6116 } else { 6117 EltTy = T; 6118 } 6119 6120 // Retrieve the last enumerator's value, extent that type to the 6121 // type that is supposed to be large enough to represent the incremented 6122 // value, then increment. 6123 EnumVal = LastEnumConst->getInitVal(); 6124 EnumVal.setIsSigned(EltTy->isSignedIntegerType()); 6125 EnumVal.zextOrTrunc(Context.getTypeSize(EltTy)); 6126 ++EnumVal; 6127 6128 // If we're not in C++, diagnose the overflow of enumerator values, 6129 // which in C99 means that the enumerator value is not representable in 6130 // an int (C99 6.7.2.2p2). However, we support GCC's extension that 6131 // permits enumerator values that are representable in some larger 6132 // integral type. 6133 if (!getLangOptions().CPlusPlus && !T.isNull()) 6134 Diag(IdLoc, diag::warn_enum_value_overflow); 6135 } else if (!getLangOptions().CPlusPlus && 6136 !isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 6137 // Enforce C99 6.7.2.2p2 even when we compute the next value. 6138 Diag(IdLoc, diag::ext_enum_value_not_int) 6139 << EnumVal.toString(10) << 1; 6140 } 6141 } 6142 } 6143 6144 if (!EltTy->isDependentType()) { 6145 // Make the enumerator value match the signedness and size of the 6146 // enumerator's type. 6147 EnumVal.zextOrTrunc(Context.getTypeSize(EltTy)); 6148 EnumVal.setIsSigned(EltTy->isSignedIntegerType()); 6149 } 6150 6151 val.release(); 6152 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, 6153 Val, EnumVal); 6154} 6155 6156 6157Sema::DeclPtrTy Sema::ActOnEnumConstant(Scope *S, DeclPtrTy theEnumDecl, 6158 DeclPtrTy lastEnumConst, 6159 SourceLocation IdLoc, 6160 IdentifierInfo *Id, 6161 SourceLocation EqualLoc, ExprTy *val) { 6162 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl.getAs<Decl>()); 6163 EnumConstantDecl *LastEnumConst = 6164 cast_or_null<EnumConstantDecl>(lastEnumConst.getAs<Decl>()); 6165 Expr *Val = static_cast<Expr*>(val); 6166 6167 // The scope passed in may not be a decl scope. Zip up the scope tree until 6168 // we find one that is. 6169 S = getNonFieldDeclScope(S); 6170 6171 // Verify that there isn't already something declared with this name in this 6172 // scope. 6173 NamedDecl *PrevDecl = LookupSingleName(S, Id, LookupOrdinaryName, 6174 ForRedeclaration); 6175 if (PrevDecl && PrevDecl->isTemplateParameter()) { 6176 // Maybe we will complain about the shadowed template parameter. 6177 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 6178 // Just pretend that we didn't see the previous declaration. 6179 PrevDecl = 0; 6180 } 6181 6182 if (PrevDecl) { 6183 // When in C++, we may get a TagDecl with the same name; in this case the 6184 // enum constant will 'hide' the tag. 6185 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 6186 "Received TagDecl when not in C++!"); 6187 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 6188 if (isa<EnumConstantDecl>(PrevDecl)) 6189 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 6190 else 6191 Diag(IdLoc, diag::err_redefinition) << Id; 6192 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 6193 if (Val) Val->Destroy(Context); 6194 return DeclPtrTy(); 6195 } 6196 } 6197 6198 EnumConstantDecl *New = CheckEnumConstant(TheEnumDecl, LastEnumConst, 6199 IdLoc, Id, Owned(Val)); 6200 6201 // Register this decl in the current scope stack. 6202 if (New) { 6203 New->setAccess(TheEnumDecl->getAccess()); 6204 PushOnScopeChains(New, S); 6205 } 6206 6207 return DeclPtrTy::make(New); 6208} 6209 6210void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc, 6211 SourceLocation RBraceLoc, DeclPtrTy EnumDeclX, 6212 DeclPtrTy *Elements, unsigned NumElements, 6213 Scope *S, AttributeList *Attr) { 6214 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX.getAs<Decl>()); 6215 QualType EnumType = Context.getTypeDeclType(Enum); 6216 6217 if (Attr) 6218 ProcessDeclAttributeList(S, Enum, Attr); 6219 6220 if (Enum->isDependentType()) { 6221 for (unsigned i = 0; i != NumElements; ++i) { 6222 EnumConstantDecl *ECD = 6223 cast_or_null<EnumConstantDecl>(Elements[i].getAs<Decl>()); 6224 if (!ECD) continue; 6225 6226 ECD->setType(EnumType); 6227 } 6228 6229 Enum->completeDefinition(Context.DependentTy, Context.DependentTy); 6230 return; 6231 } 6232 6233 // TODO: If the result value doesn't fit in an int, it must be a long or long 6234 // long value. ISO C does not support this, but GCC does as an extension, 6235 // emit a warning. 6236 unsigned IntWidth = Context.Target.getIntWidth(); 6237 unsigned CharWidth = Context.Target.getCharWidth(); 6238 unsigned ShortWidth = Context.Target.getShortWidth(); 6239 6240 // Verify that all the values are okay, compute the size of the values, and 6241 // reverse the list. 6242 unsigned NumNegativeBits = 0; 6243 unsigned NumPositiveBits = 0; 6244 6245 // Keep track of whether all elements have type int. 6246 bool AllElementsInt = true; 6247 6248 for (unsigned i = 0; i != NumElements; ++i) { 6249 EnumConstantDecl *ECD = 6250 cast_or_null<EnumConstantDecl>(Elements[i].getAs<Decl>()); 6251 if (!ECD) continue; // Already issued a diagnostic. 6252 6253 const llvm::APSInt &InitVal = ECD->getInitVal(); 6254 6255 // Keep track of the size of positive and negative values. 6256 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 6257 NumPositiveBits = std::max(NumPositiveBits, 6258 (unsigned)InitVal.getActiveBits()); 6259 else 6260 NumNegativeBits = std::max(NumNegativeBits, 6261 (unsigned)InitVal.getMinSignedBits()); 6262 6263 // Keep track of whether every enum element has type int (very commmon). 6264 if (AllElementsInt) 6265 AllElementsInt = ECD->getType() == Context.IntTy; 6266 } 6267 6268 // Figure out the type that should be used for this enum. 6269 // FIXME: Support -fshort-enums. 6270 QualType BestType; 6271 unsigned BestWidth; 6272 6273 // C++0x N3000 [conv.prom]p3: 6274 // An rvalue of an unscoped enumeration type whose underlying 6275 // type is not fixed can be converted to an rvalue of the first 6276 // of the following types that can represent all the values of 6277 // the enumeration: int, unsigned int, long int, unsigned long 6278 // int, long long int, or unsigned long long int. 6279 // C99 6.4.4.3p2: 6280 // An identifier declared as an enumeration constant has type int. 6281 // The C99 rule is modified by a gcc extension 6282 QualType BestPromotionType; 6283 6284 bool Packed = Enum->getAttr<PackedAttr>() ? true : false; 6285 6286 if (NumNegativeBits) { 6287 // If there is a negative value, figure out the smallest integer type (of 6288 // int/long/longlong) that fits. 6289 // If it's packed, check also if it fits a char or a short. 6290 if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) { 6291 BestType = Context.SignedCharTy; 6292 BestWidth = CharWidth; 6293 } else if (Packed && NumNegativeBits <= ShortWidth && 6294 NumPositiveBits < ShortWidth) { 6295 BestType = Context.ShortTy; 6296 BestWidth = ShortWidth; 6297 } else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 6298 BestType = Context.IntTy; 6299 BestWidth = IntWidth; 6300 } else { 6301 BestWidth = Context.Target.getLongWidth(); 6302 6303 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) { 6304 BestType = Context.LongTy; 6305 } else { 6306 BestWidth = Context.Target.getLongLongWidth(); 6307 6308 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 6309 Diag(Enum->getLocation(), diag::warn_enum_too_large); 6310 BestType = Context.LongLongTy; 6311 } 6312 } 6313 BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType); 6314 } else { 6315 // If there is no negative value, figure out the smallest type that fits 6316 // all of the enumerator values. 6317 // If it's packed, check also if it fits a char or a short. 6318 if (Packed && NumPositiveBits <= CharWidth) { 6319 BestType = Context.UnsignedCharTy; 6320 BestPromotionType = Context.IntTy; 6321 BestWidth = CharWidth; 6322 } else if (Packed && NumPositiveBits <= ShortWidth) { 6323 BestType = Context.UnsignedShortTy; 6324 BestPromotionType = Context.IntTy; 6325 BestWidth = ShortWidth; 6326 } else if (NumPositiveBits <= IntWidth) { 6327 BestType = Context.UnsignedIntTy; 6328 BestWidth = IntWidth; 6329 BestPromotionType 6330 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 6331 ? Context.UnsignedIntTy : Context.IntTy; 6332 } else if (NumPositiveBits <= 6333 (BestWidth = Context.Target.getLongWidth())) { 6334 BestType = Context.UnsignedLongTy; 6335 BestPromotionType 6336 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 6337 ? Context.UnsignedLongTy : Context.LongTy; 6338 } else { 6339 BestWidth = Context.Target.getLongLongWidth(); 6340 assert(NumPositiveBits <= BestWidth && 6341 "How could an initializer get larger than ULL?"); 6342 BestType = Context.UnsignedLongLongTy; 6343 BestPromotionType 6344 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 6345 ? Context.UnsignedLongLongTy : Context.LongLongTy; 6346 } 6347 } 6348 6349 // Loop over all of the enumerator constants, changing their types to match 6350 // the type of the enum if needed. 6351 for (unsigned i = 0; i != NumElements; ++i) { 6352 EnumConstantDecl *ECD = 6353 cast_or_null<EnumConstantDecl>(Elements[i].getAs<Decl>()); 6354 if (!ECD) continue; // Already issued a diagnostic. 6355 6356 // Standard C says the enumerators have int type, but we allow, as an 6357 // extension, the enumerators to be larger than int size. If each 6358 // enumerator value fits in an int, type it as an int, otherwise type it the 6359 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 6360 // that X has type 'int', not 'unsigned'. 6361 6362 // Determine whether the value fits into an int. 6363 llvm::APSInt InitVal = ECD->getInitVal(); 6364 6365 // If it fits into an integer type, force it. Otherwise force it to match 6366 // the enum decl type. 6367 QualType NewTy; 6368 unsigned NewWidth; 6369 bool NewSign; 6370 if (!getLangOptions().CPlusPlus && 6371 isRepresentableIntegerValue(Context, InitVal, Context.IntTy)) { 6372 NewTy = Context.IntTy; 6373 NewWidth = IntWidth; 6374 NewSign = true; 6375 } else if (ECD->getType() == BestType) { 6376 // Already the right type! 6377 if (getLangOptions().CPlusPlus) 6378 // C++ [dcl.enum]p4: Following the closing brace of an 6379 // enum-specifier, each enumerator has the type of its 6380 // enumeration. 6381 ECD->setType(EnumType); 6382 continue; 6383 } else { 6384 NewTy = BestType; 6385 NewWidth = BestWidth; 6386 NewSign = BestType->isSignedIntegerType(); 6387 } 6388 6389 // Adjust the APSInt value. 6390 InitVal.extOrTrunc(NewWidth); 6391 InitVal.setIsSigned(NewSign); 6392 ECD->setInitVal(InitVal); 6393 6394 // Adjust the Expr initializer and type. 6395 if (ECD->getInitExpr()) 6396 ECD->setInitExpr(new (Context) ImplicitCastExpr(NewTy, 6397 CastExpr::CK_IntegralCast, 6398 ECD->getInitExpr(), 6399 /*isLvalue=*/false)); 6400 if (getLangOptions().CPlusPlus) 6401 // C++ [dcl.enum]p4: Following the closing brace of an 6402 // enum-specifier, each enumerator has the type of its 6403 // enumeration. 6404 ECD->setType(EnumType); 6405 else 6406 ECD->setType(NewTy); 6407 } 6408 6409 Enum->completeDefinition(BestType, BestPromotionType); 6410} 6411 6412Sema::DeclPtrTy Sema::ActOnFileScopeAsmDecl(SourceLocation Loc, 6413 ExprArg expr) { 6414 StringLiteral *AsmString = cast<StringLiteral>(expr.takeAs<Expr>()); 6415 6416 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext, 6417 Loc, AsmString); 6418 CurContext->addDecl(New); 6419 return DeclPtrTy::make(New); 6420} 6421 6422void Sema::ActOnPragmaWeakID(IdentifierInfo* Name, 6423 SourceLocation PragmaLoc, 6424 SourceLocation NameLoc) { 6425 Decl *PrevDecl = LookupSingleName(TUScope, Name, LookupOrdinaryName); 6426 6427 if (PrevDecl) { 6428 PrevDecl->addAttr(::new (Context) WeakAttr()); 6429 } else { 6430 (void)WeakUndeclaredIdentifiers.insert( 6431 std::pair<IdentifierInfo*,WeakInfo> 6432 (Name, WeakInfo((IdentifierInfo*)0, NameLoc))); 6433 } 6434} 6435 6436void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name, 6437 IdentifierInfo* AliasName, 6438 SourceLocation PragmaLoc, 6439 SourceLocation NameLoc, 6440 SourceLocation AliasNameLoc) { 6441 Decl *PrevDecl = LookupSingleName(TUScope, AliasName, LookupOrdinaryName); 6442 WeakInfo W = WeakInfo(Name, NameLoc); 6443 6444 if (PrevDecl) { 6445 if (!PrevDecl->hasAttr<AliasAttr>()) 6446 if (NamedDecl *ND = dyn_cast<NamedDecl>(PrevDecl)) 6447 DeclApplyPragmaWeak(TUScope, ND, W); 6448 } else { 6449 (void)WeakUndeclaredIdentifiers.insert( 6450 std::pair<IdentifierInfo*,WeakInfo>(AliasName, W)); 6451 } 6452} 6453